Biggest change for players and organisers is the return of fans at Flushing Meadows, which was eerily quiet in 2020

German world number four defeated Andrey Rublev 6-2 6-3 in less than an hour in Cincinnati to win his second Masters

ATP Tour has publicly encouraged players to get vaccinated as the Greek is among those who still have reservations

Top-ranked Serbian star could become the first man since Rod Laver in 1969 to win all four major titles in one year

Swiss star is regarded as one of the greatest players of all time as he has won 20 Grand Slam titles and 103 trophies

World number one Novak Djokovic came up short in his quest to become the first man to win a Golden Slam

Serb tennis star smashes racquets in anger during 6-4, 6-7 (6/8), 6-3 defeat to Spain's Carreno Busta

Second-seed defeated Italy's Fognini 6-2, 3-6, 6-2 to set up a last-eight meeting with Pablo Carreno Busta of Spain

Four-time Grand Slam champ powered past Viktorija Golubic 6-3, 6-2 while the Serb focuses on Golden Grand Slam

Tennis stars call on organisers to delay the start of sport’s matches after winning openers in sweltering heat