Former US Open champ Del Potro hints at retirement as injuries take toll

Juan Martin del Potro undergoes new surgery on troublesome knee

Juan Martin del Potro to miss Australian Open due to knee injury

Juan Martin del Potro postpones return on medical ground

Roger Federer optimistic about US Open chances

Injured Rafael Nadal, Juan Martin del Potro pull out of Miami Open

Delray Beach Open: Juan Martin Del Potro races into second round

Kei Nishikori to replace Juan Martin Del Potro at ATP Finals

Shanghai Masters: Del Potro suffers fractured kneecap, docs evaluate recovery

US Open: Rafael Nadal's repeat bid in NYC derailed by injury

Nadal survives thriller to down Del Potro in quarter-finals

Thiem, Nadal in French Open final

French Open : Juan Del Potro defeats John Isner to reach last eight in Paris

French Open: Croatian Marin Cilic stands firm to withstand Fognini fightback

Del Potro powers on with menacing display

Juan Martin del Potro powers on with menacing display

Juan Martin del Potro doubt for Roland Garros

Isner stuns Del Potro, to meet Zverev in Miami Open final

Del Potro streaks into Miami semis with gritty win over Raonic

Miami Open: Del Potro, Raonic advance; Cilic ousted by Isner