Custer, who snapped a 30-race winless streak, passed Reddick on the backstretch after their cars banged doors.
It is Custer’s second Xfinity Series win. Custer had to rebound from a penalty for a crew member going over the pit wall too soon on Lap 127.
“I can’t believe it,” Custer told NBCSN at the start-finish line. “We just did all we could. I drove it in deeper than I have all weekend into (Turn) 1 trying to get on (Reddick’s) bumper. It worked out.”
Reddick, who placed second, admitted to making a “mistake” on the last lap as they exited Turn 2, which allowed Custer to get a run on him.
“I’m not mad at all with what happened there,” Reddick told NBCSN. “I think a lot of him. He’s a great driver.”
The win locks Custer into the championship four at Homestead-Miami Speedway, the site of his first series win.
“We haven’t won all year and we’ve been so close,” Custer said. “We kept going and this is the perfect time to (win).”
STAGE 1 WINNER: Daniel Hemric
STAGE 2 WINNER: Cole Custer
WHO HAD A GOOD DAY: Austin Cindric earned his fifth career top five after he started from the rear in a backup car and suffered damage to his right-front bumper on the first lap … John Hunter Nemechek bounced back from a Lap 1 spin to finish fourth … Justin Allgaier earned his first top five at Texas in 17 starts.
WHO HAD A BAD DAY: Christopher Bell, who started from the pole, earned his second consecutive DNF after he was spun by Austin Cindric and wrecked on Lap 134 … Ryan Truex wrecked on Lap 126 and finished 33rd … Brandon Jones managed to place sixth and Michael Annett finished 16th after they made contact and spun on a Lap 97 restart. Jones later got loose and wrecked teammate Ryan Preece on Lap 139. Preece placed 31st.
NOTABLE: The race saw a track record 13 cautions … Cole Custer has finished in the top five in all four of his Xfinity starts at Texas.
QUOTE OF THE RACE No. 1: “The 2 (Matt Tifft) drove into the back of me off of (Turn 2) and that put me in the middle and put the 3 (Shane Lee) underneath me. He just lost it underneath me and took me out. Nothing the 3 could do. The 2 is the one that put me in that situation. It’s all good. We work really good together. It’s just a frustrating day. You’re bound to have days where we run into each but never happy about it when it happens.” – Daniel Hemric to NBC Sports and NASCAR.com on the incident with his two teammates on Lap 194.
QUOTE OF THE RACE No. 2: “The good thing is we ran together the whole race and both of our cars had speed. I think both we’re both frustrated at the end because we felt like it played out to where we got to the back of the pack and we were both trying to make our way back up. Honestly, I don’t think I ever touched (Hemric). I think the air got him free. I had momentum behind, so once he got sideways, I just tried to duck out to make sure he didn’t get turned and I had a clear path too. He was frustrated that he got put in that situation but he understood that I had to go. If I would have gave, somebody would have done the same to me and put me in the same spot. It’s so narrow coming off of (Turn) 2. We’ll be find. We’ll talk it out.” – Matt Tifft to NBC Sports
WHAT’S NEXT: Whelen Trusted to Perform 200 at ISM Raceway at 3:30 p.m. ET on Nov. 10 on NBCSN.