Tennis: Miami OpenMar 24, 2019; Miami Gardens, FL, USA; John Isner of the United States hits a backhand against Albert Ramos-Vinolas of Spain (not pictured) in the third round of the Miami Open at Miami Open Tennis Complex. Mandatory Credit: Geoff Burke-USA TODAY Sports
(Reuters) - Defending champion John Isner unleashed 16 aces in claiming a 7-5 7-6(6) victory over determined Spaniard Albert Ramos-Vinolas in the third round of the Miami Open on Sunday.
Ramos-Vinolas broke Isner to start the match but the American saved the next four break points he faced to advance.
The seventh seed will face Britain's 19th-seeded Kyle Edmund in the fourth round.
Edmund beat Canadian 12th seed Milos Raonic 6-4 6-4.
Isner has practised with Edmund in Miami and they have split two meetings.
(Reporting by Gene Cherry in Raleigh, North Carolina; editing by Clare Fallon)