The 28-year-old Wallace from Mobile, Alabama, led 58 of 267-scheduled laps, including the final 43, en route to his second Cup career victory at Kansas.
The two-time Xfinity Series champion from Corning, California, led a race-high 38 of 86 over-scheduled laps before fending off Chastain in overtime to grab his second Cup Series career victory.
Elliott started on the pole and swept all the stages, taking the win with a pass for the lead on Corey LaJoie with two laps to go. It was Elliott's third win of the season, and he leads the points standings.
The 2018 Cup Series champion led 20 of 242 over-scheduled laps and prevailed in a late crossover battle with Kyle Busch to capture the inaugural Cup event in Madison, Illinois.
The 24-year-old Byron from Charlotte, North Carolina, led a race-high 212 of 403 and fended off Joey Logano during an overtime shootout to repeat as a Cup winner at the Paperclip-shaped short track.
