STANFORD, Calif. -- Arizona's Roger Matalonga knocked off second-seeded John Isner of Georgia 7-6 (5), 6-4 on Thursday in the second round of the NCAA men's singles tournament.
"It's definitely an upset; for sure my best match," said Matalonga, who also beat 35th-ranked Roger Gubser of Texas in the first round. "He's a great player and he showed that in team play. I thought he might be a little tired and after winning that first set, I thought I had a chance."
Matalonga, who owns a record of 22-14 this year, was down 5-1 in the first set before rallying for the victory and gaining confidence against Isner, who finished his season 45-2.
"Against a guy like Isner you just have to hang in there and wait for your opportunity," Arizona coach Tad Berkowitz said. "He just stayed with it. He was one of the last guys picked for the tournament and he's taken advantage."
Men's top seed Benjamin Kohlloeffel of UCLA and women's No. 1 seed Audra Cohen of Miami both dropped their first sets, but both were able to rally for the wins.
Kohlloeffel came back to beat Colorado's Eric Molnar, 2-6, 6-4, 6-2.
Third-seeded Luigi D'Agord of Miami was pushed by Illinois' Kevin Anderson before winning 7-6 (3), 6-3
Cohen re-established her game midway through the second set and dominated action from that point in a 4-6, 6-4, 6-0 victory over Stanford's Whitney Deason.
"I came out really slow and played an awful first set," Cohen said. "I didn't feel like I was in it until halfway through the second set. I'd say when I went up 5-4 in the second I really just stepped up and quit being a baby."
Second-seeded Kristi Miller of Georgia Tech had it a little easier in a 6-3, 6-2 victory over Duke's Jackie Carleton. Third-seeded Daniela Bercek of Duke beat Iowa's Meg Racette, 6-4, 6-2.
Matalonga lost in the first round of the Pac-10 individual championships but has had time to prepare for a good run in the NCAAs.
"The Pac-10 is tough," he said. "I was not well-prepared and tired mentally. If you're not 100 percent, you're going to lose no matter who you play. I had time to talk about every possible match this week."