Tennis great Andre Agassi isn't ruling out Roger Federer playing until he's 40 as the Swiss marvel enters the second week of a grand slam for an incredible 60th time.
Runner-up to Federer (pictured) aged 35 at the 2005 US Open, Agassi was done a year later and, more than a decade on, remains in awe of the 19-time major winner's longevity.
Federer takes on little-known Hungarian Marton Fucsovics today for a 14th Australian Open quarter-final berth in the past 15 years as he strives to defend his crown at almost 36-and-a-half.
"Listen, I'm out of the business of predicting him any more because I've been wrong so many times," Agassi said when asked if Federer could play into his 40s.
"He keeps impressing and the game should just love him and appreciate him while he's here."