Tennis - Adria Tour - Zadar, Croatia - June 19, 2020 Serbia's Novak Djokovic poses for the picture next to Croatia's Marin Cilic and Borna Coric during the press conference. Picture taken June 19, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 19, 2020 Serbia's Novak Djokovic poses for the picture next to Biserka Petrovic during the press conference. Picture taken June 19, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 19, 2020 Serbia's Novak Djokovic greets with Olga Danilovic against Croatia's Ana Konjuh and Borna Coric. Picture taken June 19, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 19, 2020 Serbia's Novak Djokovic greets with Croatia's Marin Cilic against Germany's Alexander Zverev and Croatia's Borna Coric. Picture is taken June 19, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 19, 2020 Serbia's Novak Djokovic greets with Croatia's Borna Coric next to the Croatia's Ana Konjuh and Serbia's Olga Danilovic. Picture taken June 19, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic shakes hand with a referee after winning his match against Croatia's Nino Serdarusic. Picture taken June 21, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic greets with Croatia's Borna Coric after winning his match. Picture taken June 20, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic poses for a picture before the match with Serbia's Pedja Krstin. Picture taken June 20, 2020. REUTERS/Antonio Bronic REFILE - CORRECTING DATE 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic shake hand with Croatia's Nino Serdarusic after winning his match. Picture is taken June 21, 2020. REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Police officers ask people to leave a bar near the venue after the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 General view of an empty court and stands after the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Fans talk with medical staff after the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 A security guard is seen after the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Fans leave the stands after the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 General view of fans by the court before the cancellation of the final match was announced after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Djordje Djokovic and Goran Ivanisevic on the court announcing the cancellation of the final match after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Djordje Djokovic and Goran Ivanisevic during a press conference announcing the cancellation of the final match after Bulgaria's Grigor Dimitrov tested positive for the coronavirus disease (COVID-19) REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Croatia's Marin Cilic in action during his match against Serbia's Danilo Petrovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic celebrates winning his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic celebrates winning his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic celebrates winning his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Russia's Andrey Rublev in action during his match against Germany's Alexander Zverev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Germany's Alexander Zverev in action during his match against Russia's Andrey Rublev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Croatia's Borna Coric in action during his match against Serbia's Pedja Krstin REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 21, 2020 Croatia's Borna Coric in action during his match against Serbia's Pedja Krstin REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Germany's Alexander Zverev celebrates after winning his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Germany's Alexander Zverev celebrates after winning his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Marin Cilic in action during his match against Germany's Alexander Zverev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Marin Cilic in action during his match against Germany's Alexander Zverev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Germany's Alexander Zverev in action during his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Germany's Alexander Zverev in action during his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic celebrates after his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic celebrates after his match against Croatia's Borna Coric REUTERS/Antonio Bronic TPX IMAGES OF THE DAY 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic celebrates after his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Borna Coric in action during his match against Serbia's Novak Djokovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Borna Coric in action during his match against Serbia's Novak Djokovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic in action during his match against Croatia's Borna Coric REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Borna Coric in action during his match against Serbia's Novak Djokovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Russia's Andrey Rublev in action during his match against Serbia's Danilo Petrovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Danilo Petrovic in action during his match against Russia's Andrey Rublev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Russia's Andrey Rublev in action during his match against Serbia's Danilo Petrovic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Nino Serdarusic in action during his match against Serbia's Pedja Krstin REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Pedja Krstin in action during his match against Croatia's Nino Serdarusic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Marin Cilic in action during his match against Russia's Andrey Rublev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Russia's Andrey Rublev in action during his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Russia's Andrey Rublev in action during his match against Croatia's Marin Cilic REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 A shadow of Croatia's Borna Coric in action during his match against Bulgaria's Grigor Dimitrov REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Marin Cilic in action during his match against Russia's Andrey Rublev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Croatia's Marin Cilic in action during his match against Russia's Andrey Rublev REUTERS/Antonio Bronic 

Tennis - Adria Tour - Zadar, Croatia - June 20, 2020 Serbia's Novak Djokovic during his match against Serbia's Pedja Krstin REUTERS/Antonio Bronic