WACO — Denzel Mims caught three touchdown passes, Grayland Arnold returned a punt 73 yards for a score, and Baylor beat UTSA 63-14 on Saturday for its fourth consecutive win.

Charlie Brewer completed 12 of 16 passes for 163 yards and the three TDs to Mims while playing only the first half, in which the Bears (2-0) built a 35-0 lead. Brewer also had a 5-yard touchdown run on a blistering hot day.

The temperature at kickoff was 99 degrees. It was much warmer on the playing turf, though, so much so that Brewer felt a burning sensation in his feet, and coach Matt Rhule sent him to an early shower and didn’t let him play after halftime.

“I’m good,” said Brewer, who had X-rays to make sure there were no issues. “Feet were hot. I tried to go back in, and he wouldn’t let me.”

Brewer’s backup, redshirt freshman Gerry Bohanon, ran seven times for 93 yards. He gained 38 yards on his first carry and had a 2-yard TD run on the first drive after halftime.

The Roadrunners (1-1) trailed 49-0 before a 16-play drive capped by true freshman Sincere McCormick’s 2-yard TD run at the end of the third quarter. He added a 54-yard scoring run after that.

“The reality was we didn’t do anything very well in any aspect of the game, offense, defense or special teams,” UTSA coach Frank Wilson said.

Mims had all seven of his catches for 101 yards in the first half of his second career three-touchdown game. The senior was wide open in the end zone for a 9-yard TD to start the scoring when cornerback Cassius Grady fell down. Mims got behind the same defender along the sideline for a 30-yard TD and then kicked over the pylon while scoring to make it 21-0.

Arnold had Baylor’s first punt return for a touchdown since 2005 midway through the second quarter. After fielding the ball and sliding to his right, Arnold sprinted down the sideline and got a nice downfield block from linebacker Blake Lynch.

“It was a pretty complete game, a clean game, not a lot of penalties, didn’t turn the football over, not a lot of missed assignments or errors,” Rhule said. “So, we looked like we knew what we were doing in a lot of areas.”

UTSA dual-threat quarterback Frank Harris, who was in the same Texas high school recruiting class as Brewer, found things much tougher against a Big 12 defense in his second game. The end of Harris’ high school career and the start of his college career were hampered by injuries to both knees.

After 329 total yards and three TD passes in his debut, he was 15-of-24 passing for 93 yards and had nine carries for 3 yards while being sacked three times against Baylor.

“He is our starting quarterback. He has to go through these growing pains,” Wilson said.

The Bears followed a season-opening 39-point win over an FCS team by scoring their most points since 2015.

Handily taking care of the early part of the schedule is an indication of progress in the third year under Rhule. The Bears lost at home to UTSA two years ago early in Rhule’s first season. They have an open date and play another nonconference game against Rice on Sept. 21 before their Big 12 opener at home against No. 25 Iowa State.