UC Davis (4-3) trailed most of the game while Denham, the starting quarterback, was at the helm. But Denham (20 of 35, 259 yards, TD) was forced from the game with an injury midway through the third period, with Portland State ahead 28-17.
The Aggies then caught fire behind Heyworth, the backup, who wound up 6 of 7 for 82 yards and two touchdowns. Sean Kelley's 30-yard field goal with 4:40 to play broke a 31-31 tie.
Filling in for injured starter Drew Hubel for the second consecutive week, Connor Cavanaugh finished 12 of 18 for 131 yards and two touchdowns for Portland State (2-6). He also rushed 13 times for 50 yards.
Texas Tech WR Jakeem Grant turned a trick play into a touchdown in the final minutes, leading the Red Raiders past the Longhorns.
Todd McShay analyzes six college football players with something to prove this weekend, including Michigan CB Jourdan Lewis, who will face Ohio State WR Michael Thomas on Saturday.
ESPN college football analyst Robert Smith explains how Michigan likes to pound away with the running game but is still be able to use a big-play passing attack with the same look offensively.
Munaweera wants to launch it down the ground... But he does not get hold of it. He can only skewer it to mid-on, where Shadman pouches it
Last season's 61-58 slugfest will be hard to top, but both Baylor and TCU still have much at stake as they meet Friday night.
Success on the ground could well dictate who controls this matchup, whose winner still has some shot at the College Football Playoff.