Mies defeated Mitchell Frank from Virginia, taking a 4-6, 6-0, 6-2 victory. It was just the fourth collegiate loss for Frank, a sophomore whose overall record dropped to 59-4.
Mies and his partner Daniel Cochrane advanced to the second round of the doubles competition with a straight sets victory on Thursday. The Auburn team took a 7-5, 6-1 win over Campbell Johnson and Christoffer Konigsfeldt of Cal. Mies and Cochrane are the sixth seeded team.
"Our guys really stepped up today," Auburn coach Eric Shore said. "Andy stepped up big-time against a really tough guy. He has lost something like four matches in college. He makes everything. And Andy earned it, he did a great job.
"And then Dan stepped up in doubles," Shore said. "Our first set point at 6-5, he dug out this ball, and the match was basically over after that. It really helped because it lifted Andy after what had been a long day, and we got on them early in the second set.
"It's great for Andy," said Shore. "He makes All-American for the first time singles. And good for Dan, waiting around all day, and then he gets it done. Great day for us."
Mies will face 45th-ranked Yannick Hanfmann of Southern Cal in the singles round of 16 Friday with the match tentatively set for a 10 a.m CDT start.
Mies and Cochrane will face 60th-ranked Lucas Ana and Victor Valente of Georgia State, who pulled an upset over Kentucky's team of Tom Jomby and Kevin Lai in the first round. A start time has not been set for that match.
The last Auburn entry in the women's competition was eliminated on Thursday as freshman Pleun Burgmans and senior Plamena Kurteva dropped a 6-3, 6-4 decision to Maria Belaya and Jeltje Loomans from William & Mary.
"Pleun and Plamena both had great seasons and were a big part of all the success we had as a team this year," Auburn women's head coach Lauren Longbotham Meisner said. "I'm so proud of both of them and all they accomplished this year.
"I'm really proud of Plamena and all her accomplishments over her four-year career both on the courts and as a student," Longbotham added. "She's been a great example to our young team in my two years at Auburn."