Juan Martin del Potro withdraws from Australian Open due to knee problems
Three-time champion Andy Murray and Japanese tennis star Kei Nishikori have already withdrawn from the Australian Open.
Three-time champion Andy Murray and Japanese tennis star Kei Nishikori have already withdrawn from the Australian Open.
Talking about the 2019 Rogers Cup, it will be held in Montreal from 3-11 August.
Del Potro, a fan favourite who won a silver medal at the 2016 Summer Olympics in Rio de Janeiro and a bronze medal at the 2012 London Games, is undergoing rehab in his hometown of Tandil.
Stefanos Tsitsipas advanced after Federer -- returning to clay after a two-year absence -- retired with a right leg injury before their game.
Kei Nishikori will compete in the ATP Finals in London following the withdrawal of Juan Martin del Potro due to a right knee injury.
It was plain sailing for the 31-year-old Serb who is chasing a 14th Slam title to take him level with Pete Sampras on the all-time list.
After the Argentine blasted a forehand winner to close out the second set, Nadal could not continue.
Del Potro dropped his first set of the tournament against 11th seed Isner, who was playing in his maiden quarter-final at his home Slam.
The 2009 champion was untouchable on serve and did not face a single break point throughout the one-hour, 56-minute match here
Nadal didn't immediately celebrate his win, instead choosing to offer commiserations to his opponent.
