Kevin Harvick appeared in command and head to the win at Phoenix Raceway when a late-race caution for a spin by Harrison Burton sent all the lead-lap cars to pit road.
The top six, including Byron, took on only two new tires, but Kyle Larson was first off pit road.
Shortly after the restart with three laps remaining, another wreck sent the race into a two-lap overtime. On the ensuing restart, Byron went to the outside of Larson and with a shove from Tyler Reddick, powered into the lead with one lap to go.
Byron then held off Ryan Blaney by 0.330 seconds to secure his second straight NASCAR Cup Series win and sixth of his career.
“Owe the last couple weeks to him,” Byron said of his crew chief, Rudy Fugle. “He’s done a really good job strategy-wise and execution-wise and we’ve done a good job to put ourselves in those positions on the front row with a shot at the end.
“Thanks to everybody back at Hendrick Motorsports, putting together great cars, doing a great job. This is a big credit to them.”
Reddick ended up third, Larson – who led the most laps (201) – was fourth and Harvick rounded out the top-five.
Completing the top-10 were Christopher Bell, Chase Briscoe, Kyle Busch, Alex Bowman and Josh Berry, who was in his second start filling in for the injured Chase Elliott.
On the final lap, Denny Hamlin appeared to go up the track and into Ross Chastain as both hit the wall. Hamlin was credited with a 23rd place finish and Chastain 24th.
During the break between Stages 2 and 3, the lead-lap cars all pit with Larson first off pit road. Ty Gibbs had to restart from the rear of the field for speeding on pit road during his stop.
On the restart on Lap 195, Larson was followed by Harvick, Byron, Brad Keselowski and Reddick.
With 100 laps remaining, Larson had run out to 3-second lead over Harvick as Byron remained in third.
Berry pit on Lap 241 to kick off a final round of green-flag pit stops to take on new tires and fuel to make it to the finish of the race.
Daniel Suarez was assessed a pass-through penalty after speeding on pit road during his stop. He was caught speeding again while serving his penalty and was assessed another pass-through.
Once the cycle of stops was completed on Lap 261 when Jones finally pit, Larson returned to the lead. He was followed by Harvick, Bell and Byron.
After hounding Larson for several laps, Harvick finally went to his inside on Lap 269 and grabbed the lead for the first…
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