Jenson Brooksby made a winning start to his 2022 season on the ATP Tour as he reached the quarter-finals of the Dallas Open.
Last year's ATP Newcomer of the Year missed the Australian swing after testing positive for COVID-19 and only made his return at the Columbus Challenger at the end of last month.
The world number 54 admitted to feeling a little nervous in his 6-3 3-6 6-3 win over Andreas Seppi, but he said: "I competed well. As an American in the U.S., it was a great crowd. I missed that atmosphere for a few months.
"I thought I stayed pretty calm out there; a good balance of calm and competing, which is always a focus of mine."
Fifth seed Adrian Mannarino enjoyed smoother progress into the quarter-finals, beating Yoshihito Nishioka 6-3 6-1.
Vasek Pospisil saved a match point before coming through 6-7 (3-7) 7-6 (8-6) 6-2 against Jurij Rodionov, setting up a last-eight clash with home favourite John Isner, whose compatriot Reilly Opelka also progressed from a big-serving contest with Cedrik-Marcel Stebe.
At the Argentina Open, Fabio Fognini progressed to his first Tour-level quarter-final since April after battling past Pedro Martinez.
The Italian won 6-4 7-6 (7-5) to secure a meeting with Federico Delbonis, the Argentine having dispatched Pablo Andujar in straight sets.
Delbonis' compatriot Diego Schwartzman also defeated Spanish opposition in the form of Jaume Munar, although the world number 15 was made to work hard for a victory that sent him into a last-eight contest with Francisco Cerundolo.
Schwartzman came through 7-6 (7-2) 7-6 (7-4) in two hours and 23 minutes, eventually closing out the victory with a return winner on his seventh match point.
"I'm very happy because it was tough at the end," Schwartzman said. "He was saving too many match points, winning too many good points at the end of the match and he had the chance to go into the third.
"I think the tie-break, in the beginning, I played better than him. But at the end, he was fighting and he was there."