Trailing 2-0 in the seventh, Iowa plated their first run. With the bases loaded and one out, Theriot lifted an RBI sac fly to center that scored Augie Ojeda. In the eighth, Iowa broke for four runs and Theriot again played a big part.
With Iowa leading 3-2 after a Geovany Soto two-run single, Theriot tripled over the head of Tyrell Godwin in left to clear the bases and put the Cubs in the lead for good at 5-2.
"I was looking for a slider," Theriot said after the game. "[Bergmann] left a sinker up and it was a good pitch. I was lucky enough to get the barrel on it. I was hoping not to get that slider because I knew I wasn't going to be able to hit that one."
Theriot, along with teammate Mike Fontenot, was bombarded with interview requests from local media outlets all week due to the two's past college careers at LSU. Theriot started Thursday's game in left field and couldn't get a glove on a pair of line drives that resulted in Zephyr hits.
"It's getting easier and easier," Theriot said when asked about playing the outfield. "I'm getting more comfortable as I go. I'm out there because Augie is a great player and you have to get him out there. Defensively, he's a game-changer. Me playing left helps everybody get their playing time."
Iowa left 11 on base and totaled nine hits. Manager Mike Quade said after Tuesday night's 2-1 victory in game two of the series that he wouldn't mind seeing a few blowout wins come his way.
"I can't remember the last time we scored four runs in an inning," Quade added on Thursday. "You just don't know who's going to pick you up on any given night. We were a club that didn't do much offensively all night, but that's why you play."
For his part, Theriot improved his average to .306 in 47 games at Iowa. He spent almost three weeks away from the Triple-A team while rotting on Dusty Baker's bench in Chicago.
"I do my thing and let the chips fall where they may," Theriot said. "You really can't think about their situation much. All I can control is how I play the game. If it works out to where I can end up back up there, great. Either way, I'll know I did what I could."
Rich Hill started and went six innings, allowing two runs on five hits. He struck out six and walked one. Andy Shipman picked up his first win in relief while New Orleans' Jason Bergmann suffered his first loss from the bullpen.
Iowa's win improved them to 29-37, 7.5 games back of first-place Nashville in the Pacific Coast League's American Northern Division.