The three-time Daytona 500 champion led 142 of 500 laps and rallied from a Lap 70 pit road speeding penalty to lead the final 134 laps and win the Playoff's Round of 16 finale under the lights at Thunder Valley.
The 26-year-old Nemechek led a race-high 154 of 200 laps and capped off the regular-season stretch with his sixth Xfinity victory of the 2023 season in dominant fashion.
The three-time Daytona 500 champion from Chesterfield, Virginia, will remain as a full-time NASCAR Cup Series competitor for Joe Gibbs Racing on a new multi-year basis.
The 2017 Cup Series champion from Mayetta, New Jersey, became the second competitor to achieve two regular-season championships after clinching the 2023 title by 48 points over teammate Denny Hamlin.
The 29-year-old Wallace from Mobile, Alabama, occupies the final Playoff vacant spot by 32 points over rookie Ty Gibbs approaching the regular-season finale of the 2023 season.
The reigning Xfinity Series champion from Charlotte, North Carolina, led a race-high 28 of 62 laps and drove away from the field during a 16-lap dash to the finish to notch his first Xfinity triumph of the season at the Brickyard.
The 26-year-old Nemechek from Mooresville, North Carolina, led a race-high 65 of 125 laps and rallied from a Lap 10 wreck involving his two Joe Gibbs Racing teammates to dominate and record the 200th Xfinity career win for JGR in the Irish Hills.
The three-time Daytona 500 champion from Chesterfield, Virginia, led nine of 160 laps and rallied from a late dust-up involving Kyle Larson with seven laps remaining to emerge victorious amid a three-lap dash to the finish for his all-time leading seventh triumph at the Tricky Triangle.
The 2017 Cup Series champion from Mayetta, New Jersey, led a race-high 254 of 301-scheduled laps and fended off Joey Logano in a nine-lap dash to the finish to capture his first elusive victory at the Magic Mile.
The 26-year-old Nemechek from Mooresville, North Carolina, led a race-high 137 of 206 over-scheduled laps en route to his second consecutive Xfinity victory in recent weeks and in overtime at the Magic Mile.
