Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Kazakhstan's Alexander Bublik in action during his quarter final match against Chile's Cristian Garin REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Kazakhstan's Alexander Bublik in action during his quarter final match against Chile's Cristian Garin REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 A groudsman sweeps the clay REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Kazakhstan's Alexander Bublik in action during his quarter final match against Chile's Cristian Garin REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Kazakhstan's Alexander Bublik in action during his quarter final match against Chile's Cristian Garin REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Chile's Cristian Garin in action during his quarter final match against Kazakhstan's Alexander Bublik REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Norway's Casper Ruud in action during his quarter final match against France's Ugo Humbert REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Norway's Casper Ruud in action during his quarter final match against France's Ugo Humbert REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Norway's Casper Ruud in action during his quarter final match against France's Ugo Humbert REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 France's Ugo Humbert in action during his quarter final match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas after winning his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas celebrates after winning his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Serbia's Dusan Lajovic in action during his quarter final match against Greece's Stefanos Tsitsipas REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas celebrates after winning his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas celebrates after winning his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 General view during the quarter final match between Serbia's Dusan Lajovic and Greece's Stefanos Tsitsipas REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Serbia's Dusan Lajovic in action during his quarter final match against Greece's Stefanos Tsitsipas REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Serbia's Dusan Lajovic in action during his quarter final match against Greece's Stefanos Tsitsipas REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Serbia's Dusan Lajovic in action during his quarter final match against Greece's Stefanos Tsitsipas REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Greece's Stefanos Tsitsipas in action during his quarter final match against Serbia's Dusan Lajovic REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 General view during the quarter final match between Spain's Roberto Bautista Agut and Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut in action during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut in action during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev after winning his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut in action during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev celebrates after winning his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut reacts during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut in action during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Spain's Roberto Bautista Agut in action during his quarter final match against Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 General view during the quarter final match between Spain's Roberto Bautista Agut and Russia's Andrey Rublev REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 25, 2020 Russia's Andrey Rublev in action during his quarter final match against Spain's Roberto Bautista Agut REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 24, 2020 Norway's Casper Ruud celebrates during his second round match against Italy's Fabio Fognini REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 24, 2020 Norway's Casper Ruud in action during his second round match against Italy's Fabio Fognini REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 24, 2020 Italy's Fabio Fognini reacts during his second round match against Norway's Casper Ruud REUTERS/Cathrin Mueller

Tennis - ATP 500 - Hamburg European Open - Am Rothenbaum, Hamburg, Germany - September 24, 2020 Italy's Fabio Fognini reacts during his second round match against Norway's Casper Ruud REUTERS/Cathrin Mueller