Byron assumed the lead on Lap 51 when Martin Truex Jr. pitted from the lead. Byron led the final 17 laps and cruised to the win in the EchoPark Automotive Grand Prix, his second win of the season.
"I feel good about my performance this year," Blaney said. "I think I'm well on my way to defending my title as Cup champion. And I think Phoenix Raceway has already defended its title as one of the most boring tracks on the schedule."
Kyle Larson dominated throughout the day on Sunday, sweeping the stages and leading 181 laps on his way to the win in the Pennzoil 400 at Las Vegas Motor Speedway.
Ryan Blaney passed Kyle Larson for second on lap 292 and held the position to claim the championship as Ross Chastain took the win at Phoenix. It is Blaney's first Cup championship.
Ryan Blaney passed Aric Almirola for the lead with 22 laps to go and pulled away to win the Xfinity 500 at Martinsville, winning his way into the Championship 4.
Keith Rodden Named Vice President of Competition; John Klausmeier Joins RCR as Technical Director and Richard Boswell Named Crew Chief of the No. 3 Chevrolet
The 2021 Xfinity Series champion from Kannapolis, North Carolina, returns as a full-time Truck Series competitor for the first time since 2016 after campaigning in the Cup Series in 2024.
The 25-year-old Herbst from Las Vegas, Nevada, will pilot the No. 35 Toyota sponsored by Monster Energy for his first full-time campaign in NASCAR's premier series and in 23XI Racing's first season fielding three full-time entries.
