Tsitsipas, with Big Three missing, makes 4th round in Miami
Ashleigh Barty of Australia reacts after defeating Jelena Ostapenko of Latvia during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Marta Lavandier)
Stefanos Tsitsipas of Greece returns to Damir Dzumhur of Bosnia during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Marta Lavandier)
Sebastian Korda, of the United States, returns a shot from Fabio Fognini, of Italy, during the Miami Open tennis tournament Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Wilfredo Lee)
Ashleigh Barty of Australia returns to Jelena Ostapenko of Latvia, during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Marta Lavandier)
Kei Nishikori gives a thumbs up to his fans in the stands after defeating Aljaz Bedene of Slovenia, during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Marta Lavandier)
Andrey Rublev, of Russia, serves to Tennys Sandgren during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Wilfredo Lee)
Stefanos Tsitsipas of Greece waves to the crowd after defeating Damir Dzumhur of Bosnia during the Miami Open tennis tournament, Saturday, March 27, 2021, in Miami Gardens, Fla. (AP Photo/Marta Lavandier)