Learner Tien defeated Jakub Mensik 6-3, 1-6, 6-7(2), 6-3, 6-4 to reach the US Open fourth round and the last 16. The match at Louis Armstrong Stadium was briefly halted when security escorted a fan out for repeatedly heckling Mensik after Mensik confronted the chair umpire and engaged with spectators. Mensik, the 17th seed, had recovered from the opening set to take the third set in a tiebreak and moved within a set of victory before Tien broke back twice in the fourth to force a decider. The 20-year-old Tien closed out the match late into the night, with one report putting the finish at about 1:35 a.m., extending his unbeaten record in five-set matches. Tien advances to the Round of 16 and will face the winner from the remaining draw in the next round.
