Andre Agassi advanced to the quarter-finals of the US Open when his fourth-round opponent Taylor Dent retired injured.
The top seed had just taken a 6-7 6-4 7-5 lead when Dent, who was struggling with an injury to his right thigh, decided to call it quits.
Agassi's victory over his fellow American was his 200th Grand Slam win - a feat achieved by only four other players - but the 33-year-old will have wished he could have reached the milestone in more emphatic fashion.
Dent's lively serve-and-volley game frustrated Agassi and the 22-year-old had looked a real danger before calling for treatment halfway through the second set.
The players had left court for a rain-break with the game poised at 5-4 in Agassi's favour but when they returned almost an hour later Dent was quick to seize advantage.
The 22-year-old broke back before negotiating his way through a tight tie-break with a combination of powerful serves and neat volleys.
Just after Dent sealed the opening set, more drizzle interrupted the flow of the match and it was almost another hour before play resumed in New York.
The young American found the first break in the fifth game of the second set as Agassi's serve was woefully short on power.
Dent could not keep up the pressure on last year's finalist as he needed treatment on his thigh during the changeover.
Agassi saw a chink in Dent's armour and forced the young American to chase around the court, spraying down his trademark passing shots.
The world number one grabbed two breaks to level the match at one-set all but he could not maintain the momentum as Dent easily broke him in the first game of the third set.
In a fascinating encounter, Agassi broke back before Dent did the same and then held serve thanks to some 130mph serves.
Despite his endeavour, Dent was clearly hopping around the court after having his thigh heavily strapped and Agassi grabbed a vital break.
The 33-year-old managed to hold his own serve despite some dreadful mis-hits and when Dent served up his 12th double fault of the match, he surrendered the third set to Agassi before deciding to retire.