Sampras

Tien is the first 19-year-old American to reach the fourth round at the Australian Open since 14-time Grand Slam winner Pete Sampras in 1990.

Sell is aware that his time as an active professional player is limited — Pete Sampras retired at 32, Andre Agassi at 36 — and he’s leveraging his skills to ensure he can transition smoothly into a post-tour career after his body breaks down or he tires of the grind.

Another factor in his atypical career has been the thriving Southern California tennis community, which has nurtured generations of stars from Sampras to the Williams sisters.

He was also the first male teenager to win a Grand Slam singles title since Pete Sampras' first US Open triumph in 1990.

For a tearful Federer, it denied him a 14th Grand Slam title, which would have drawn him level with the then all-time men's record held by Sampras.