Washington - Top-seeded Benoit Paire reached the third round of the ATP Tour's Winston-Salem Open on Tuesday, beating Prajnesh Gunneswaran 6-3, 7-5.
France's Paire, ranked 30th in the world, avenged a loss to India's Gunneswaran at Indian Wells in March.
Paire broke Gunneswaran in the penultimate game, then capped the contest with his 14th ace on match point to book a round of 16 meeting with fellow Frenchman Ugo Humbert, who defeated American Bjorn Fratangelo 3-6, 6-3, 6-2.
After enjoying a first-round bye, Paire was glad to get to work in the heat and humidity of North Carolina as part of his build-up to the US Open, which starts on Monday at Flushing Meadows in New York.
"Honestly, I like to play before the Slam," he said.
"I did the same in Lyon the week before Roland Garros and I won the tournament and after I made the last 16 at Roland Garros so it was good preparation.
"I'll try to do the same - I'll try to win a lot of matches here. I think it's important for me to play before the US Open."
Second-seeded Canadian Denis Shapovalov also advanced, beating American Tennys Sandgren 6-2, 6-4.
Sandgren, ranked 73rd in the world, was coming off a first-round victory over three-time Grand Slam champion Andy Murray, who was playing just his second singles match since the Australian Open as he bids to return to peak form in the wake of career-threatening hip surgery.
Sandgren battled back from 0-3 down in the second set - going up a service break before Shapavalov came through with a break in the final game to seal the victory.
"It was definitely a great win," said Shapovalov, who hadn't made it past the second round of an ATP event since Lyon in May and, like Paire, said he hoped a strong performance in Winston-Salem would be a springboard into the US Open.
"I've been struggling a little bit during the clay and grass court season and the hardcourt swing," he said.
"I thought it would be perfect to come play Winston-Salem, get a couple more matches under my belt and get ready for the Open.
"So far, so good," said Shapovalov, who next faces Serbian Miomir Kecmanovic, a 7-6 (7/5), 6-3 winner over Australian Alexei Popyrin.
South Korean Lee Duck-hee's ground-breaking tournament came to an end with a 4-6, 6-0, 6-3 loss to third-seeded Hubert Hurkacz of Poland.
Lee had become the first deaf player to win an ATP match with his first-round win over Henri Laaksonen.
"I'm a little bit disappointed right now," Lee admitted.
"I had many chances that I didn't utilise, but it was a great experience overall."
Meanwhile, South Africa's Lloyd Harris, who entered the tournament as the 99th-ranked player in the world, was forced to retire from his second round clash with 12th-seeded Norwegian Casper Ruud having lost the opening set 6-1.
Results on Tuesday in the ATP tournament in Winston-Salem, North Carolina (x-denotes seeding):
Benoit Paire (FRA x1) bt Prajnesh Gunneswaran (IND) 6-3, 7-5
Ugo Humbert (FRA x15) bt Bjorn Fratangelo (USA) 3-6, 6-3, 6-2
Pablo Carreno-Busta (ESP x11) bt Marius Copil (ROM) 6-3, 6-7 (3/7), 6-4
Lorenzo Sonego (ITA x7) bt Damir Dzumhur (BIH) 6-1, 6-4
Robin Haase (NED) bt Joao Sousa (POR x4) 4-6, 6-3, 6-4
John Millman (AUS x14) bt Marco Cecchinato (ITA) 6-7 (5/7), 6-4, 6-3
Casper Ruud (NOR x12) bt Lloyd Harris (RSA) 6-1, retired
Steve Johnson (USA) bt Daniel Evans (GBR x5) 6-3, 6-1
Filip Krajinovic (SRB x8) bt Tomas Berdych (CZE) 3-6, 7-5, 6-1
Frances Tiafoe (USA x10) bt Jeremy Chardy (FRA) 4-2 retired
Feliciano Lopez (ESP x16) bt Pablo Andujar (ESP) 6-4, 1-6, 7-5
Hubert Hurkacz (POL x3) bt Lee Duck-hee (KOR) 4-6, 6-0, 6-3
Sam Querrey (USA x6) bt Roberto Carballes (ESP) 6-3, 7-5
Andrey Rublev (RUS) bt Albert Ramos (ESP x9) 6-7 (5/7), 6-3, 6-1
Miomir Kecmanovic (SRB x13) bt Alexei Popyrin (AUS) 7-6 (7/5), 6-3
Denis Shapovalov (CAN x2) bt Tennys Sandgren (USA) 6-2, 6-4
Damir Dzumhur (BIH) bt Antoine Hoang (FRA) 6-7 (5/7), 6-0, 6-2
Steve Johnson (USA) bt Corentin Moutet (FRA) 6-3, 6-3
Andrey Rublev (RUS) bt Thomas Fabbiano (ITA) 6-4, 6-2