American Donald Young rallied from a break down in each of the last two sets to upend sixth-seeded Frenchman Adrian Mannarino 3-6, 7-5, 7-6 (4) in the opening round of the Memphis (Tenn.) Open on Monday.
Young, who holds an ATP rank of No. 81, erased deficits of 4-2 in the second set and 2-0 in the third -- as well as 3-1 in the third-set tiebreak -- to defeat the 28-year-old Mannarino in 2 hours, 43 minutes.
Young, 27, recorded five of his six aces in the third set to gain entry into the second round.
Japan's Yoshihito Nishioka, who reached the quarterfinals of this tournament last year, posted a 6-4, 6-4 victory over Spain's Guillermo Garcia-Lopez.
Nishioka will face second-seeded American John Isner in the next round.
Bosnian Damir Dzumhur pulled out a 6-7 (6), 7-6 (2), 6-4 win over South Africa's Kevin Anderson. The match featured only three service breaks, but Dzumhur got the only one of the decisive set.
Four-time reigning Memphis Open champion Kei Nishikori is not competing in the tournament this year.