Learner Tien advances to US Open fourth round with five-set victory

American Learner Tien secured a spot in the US Open fourth round on Saturday after a five-set victory over Jakub Mensik at Armstrong Stadium in New York. The 20-year-old is the youngest American man to reach this stage of the tournament since Andy Roddick in 2002. Coached by 1989 French Open winner Michael Chang, Tien maintained a perfect 5-0 career record in matches lasting five sets. This performance follows his efforts to improve his serve while continuing to gain momentum among his 21-and-under peers. With this result, five American men remain in the tournament field including Tommy Paul, Frances Tiafoe, Ben Shelton, and Alex Michelsen. Tien now prepares to face Karen Khachanov in the upcoming round for the first time in their careers.

• 6:31 AMYahoo Sports — Learner Tien follows in Andy Roddick’s footsteps with US Open R3 win