Jack Sock is in a rare position. Sunday marks his first fourth-round match at the U.S. Open, matching his deepest run in any Grand Slam tennis tournament.
This is Sock's chance to establish himself as the best player in a shallow pool of elite American players. It won't be easy to advance. Sock, seeded 26th, faces No. 7 Jo-Wilfried Tsonga. Winning would be an upset.
Tsonga disposed of No. 23 Kevin Anderson in the straight sets, although the finale went to a tiebreaker.
Sock made the 1 p.m. ET match in an impressive victory over No.