Juan Martin del Potro believes Novak Djokovic can end his career as the most successful Grand Slam title winner, surpassing Roger Federer's current mark of 20.
Juan Martin Del Potro
Defending champion Rafael Nadal on Sunday reached the US Open quarter-finals for the eighth time where he will face Dominic Thiem, one of only three men to defeat him in 2018.
The US Open tennis championships at a glance:
Roger Federer, a decade removed from the 2008 triumph that marked his fifth straight US Open title, is eager to hoist a trophy at Flushing Meadows again.
Rafael Nadal turned back the hands of time and the determined bid of Juan Martin Del Potro to seal his ticket in the 2018 Wimbledon semifinals.