Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 19, 2021 Russia's Daniil Medvedev speaks to the umpire during his semi final match against Greece's Stefanos Tsitsipas REUTERS/Jaimi Joy

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 17, 2021 General view as Spain's Rafael Nadal speaks to the umpire during his quarter final match against Greece's Stefanos Tsitsipas REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 15, 2021 The umpire adjusts the net during the match between Czech Republic's Karolina Muchova and Belgium's Elise Mertens REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 14, 2021 Poland's Iga Swiatek speaks with the umpire during her fourth round match against Romania's Simona Halep REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 14, 2021 Germany's Alexander Zverev speaks with the umpire during his fourth round match against Serbia's Dusan Lajovic REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 14, 2021 Germany's Alexander Zverev speaks with the umpire during his fourth round match against Serbia's Dusan Lajovic REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 14, 2021 Germany's Alexander Zverev speaks with the umpire during his fourth round match against Serbia's Dusan Lajovic REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 Umpire Carlos Ramos REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Australia's Nick Kyrgios speaks with umpire Marijana Veljovic regarding the net during his second round match against France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Australia's Nick Kyrgios speaks with umpire Marijana Veljovic regarding the net during his second round match against France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Australia's Nick Kyrgios speaks with umpire Marijana Veljovic regarding the net during his second round match against France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Umpire Marijana Veljovic during the second round match between Australia's Nick Kyrgios and France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Australia's Nick Kyrgios speaks with umpire Marijana Veljovic during his second round match against France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 Umpire Marijana Veljovic during the second round match between Australia's Nick Kyrgios and France's Ugo Humbert REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 10, 2021 The umpire Damien Dumusois speaks with Frances Tiafoe of the U.S. during his second round match against Serbia's Novak Djokovic REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 8, 2021 Canada's Denis Shapovalov hands a ball to the umpire during his first round match against Italy's Jannik Sinner REUTERS/Asanka Brendon Ratnayake

Tennis - ATP Cup - Melbourne Park, Melbourne, Australia, February 2, 2021 Canada's Denis Shapovalov speaks with the umpire during his group stage match against Serbia's Novak Djokovic REUTERS/Loren Elliott

Cricket - Third Twenty20 International - Australia v India - Sydney Cricket Ground, Sydney, Australia - December 8, 2020 India's Virat Kohli with the umpires REUTERS/Loren Elliott

Cricket - Third Twenty20 International - Australia v India - Sydney Cricket Ground, Sydney, Australia - December 8, 2020 India's Virat Kohli talks with the umpires REUTERS/Loren Elliott

Cricket - Second Twenty20 International - Australia v India - Sydney Cricket Ground, Sydney, Australia - December 6, 2020 India's KL Rahul appeals to the umpire for the wicket of Australia's Moises Henriques REUTERS/Loren Elliott

Tennis - ATP Masters 1000 - Paris Masters - AccorHotels Arena, Paris, France - November 8, 2020 Russia's Daniil Medvedev speaks with an umpire before the final against Germany's Alexander Zverev REUTERS/Gonzalo Fuentes

Tennis - ATP Masters 1000 - Paris Masters - AccorHotels Arena, Paris, France - November 7, 2020 Canada's Milos Raonic remonstrates with the umpire during his semi final match against Russia's Daniil Medvedev REUTERS/Gonzalo Fuentes

Tennis - French Open - Roland Garros, Paris, France - October 11, 2020 Spain’s Rafael Nadal gestures to a mark on the court as the umpire inspects during the final against Serbia’s Novak Djokovic REUTERS/Charles Platiau

Tennis - French Open - Roland Garros, Paris, France - October 11, 2020 Serbia's Novak Djokovic appeals to the umpire during the final against Spain’s Rafael Nadal REUTERS/Christian Hartmann

Tennis - French Open - Roland Garros, Paris, France - September 27, 2020. Britain's Andy Murray speaks to the umpire before his first round match against Switzerland's Stan Wawrinka REUTERS/Charles Platiau

Tennis - French Open - Roland Garros, Paris, France - September 27, 2020 The umpire during the first round match between France's Jeremy Chardy and Austria's Jurij Rodionov REUTERS/Christian Hartmann

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 22, 2020 General view of the umpire and spectators in the stands during the first round match between Italy's Fabio Fognini and Germany's Philipp Kohlschreiber REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 22, 2020 General view of the umpire and spectators in the stands during the first round match between Italy's Fabio Fognini and Germany's Philipp Kohlschreiber REUTERS/Cathrin Mueller

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - September 20, 2020 Canada's Denis Shapovalov talks to the chair umpire during his semi final match against Argentina's Diego Schwartzman Pool via REUTERS//Clive Brunskill

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - September 19, 2020 An umpire is pictured Pool via REUTERS/Riccardo Antimiani

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - September 15, 2020 Italy's Marco Cecchinato speaks with the umpire during his first round match against Britain's Kyle Edmund Pool via REUTERS/Riccardo Antimiani

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - September 14, 2020 France's Benoit Paire speaks with the umpire during his match against Italy's Jannik Sinner. Pool via REUTERS/Clive Brunskill

Tennis - ATP Masters 1000 - Italian Open - Foro Italico, Rome, Italy - September 14, 2020 France's Benoit Paire speaks with the umpire during his match against Italy's Jannik Sinner. Pool via REUTERS/Clive Brunskill

Cricket - First One Day International - England v Australia - Emirates Old Trafford, Manchester, Britain - September 11, 2020 A umpire checks the helmet of England's Sam Billings Jon Super/Pool via REUTERS

Cricket - First One Day International - England v Australia - Emirates Old Trafford, Manchester - September 11, 2020 Umpire David Millns changes the ball Jon Super/Pool via REUTERS

Cricket - First One Day International - England v Australia - Emirates Old Trafford, Manchester - September 11, 2020 Reserve umpire Mike Burns and umpire David Millns choose a new ball. Pool via REUTERS/Jon Super

Cricket - Third Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 25, 2020 The umpires on the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Alastair Grant/Pool via REUTERS

Cricket - Third Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 24, 2020 England's Joe Root and teammates with umpires as they walk off while bad light stops play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Alastair Grant/Pool via REUTERS

Cricket - Third Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 24, 2020 England's James Anderson, Stuart Broad and Rory Burns look on as umpires talk to each other, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Alastair Grant/Pool via REUTERS

Cricket - Third Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 24, 2020 England's James Anderson, Stuart Broad, Jofra Archer and Joe Root with an umpire, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Alastair Grant/Pool via REUTERS

Cricket - Third Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 22, 2020 The players and umpires walk off during a rain delay, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Alastair Grant/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 The umpires speak to England's Joe Root and Pakistan's Azhar Ali after a pitch inspection as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires speak with groundstaff as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 An umpire inspects the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 An umpire inspects the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Stu Forster/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 17, 2020 Umpires inspect the pitch as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Stu Forster/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 15, 2020 Pakistan's Azhar Ali with the umpire as rain delays the start of play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 14, 2020 Pakistan's Mohammad Abbas and Mohammad Rizwan as an umpire takes a light reading, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Glyn Kirk/Pool via REUTERS

Cricket - Second Test - England v Pakistan - Ageas Bowl, Southampton, Britain - August 13, 2020 England's Joe Root with an umpire as rain delays play, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Stu Forster/Pool via REUTERS

Cricket - First Test - England v Pakistan - Emirates Old Trafford, Manchester, Britain - August 6, 2020 An umpire checks the shape of the ball, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Dan Mullan/Pool via REUTERS

Cricket - First Test - England v Pakistan - Emirates Old Trafford, Manchester, Britain - August 6, 2020 An umpire checks the shape of the ball, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Dan Mullan/Pool via REUTERS

Cricket - First Test - England v Pakistan - Emirates Old Trafford, Manchester, Britain - August 5, 2020 The umpires take a reading of the light, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Dan Mullan/Pool via REUTERS

Cricket - First Test - England v Pakistan - Emirates Old Trafford, Manchester, Britain - August 5, 2020 England's Jofra Archer talks to the umpires, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) REUTERS/Lee Smith/Pool

Cricket - First Test - England v Pakistan - Emirates Old Trafford, Manchester, Britain - August 5, 2020 England's Jofra Archer talks to the umpires, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) REUTERS/Lee Smith/Pool

Cricket - Third One Day International - England v Ireland - Ageas Bowl, Southampton, Britain - August 4, 2020 The players and umpires during a minute silence for former SDLP leader John Hume, as play resumes behind closed doors following the outbreak of the coronavirus disease (COVID-19) Mike Hewitt/Pool via REUTERS