Busch’s victory is also Toyota’s fourth consecutive to open the 2021 season.
ThorSport Racing’s Ben Rhodes won the first two on the oval, then the road course at Daytona International Speedway. Kyle Busch Motorsports driver John Hunter Nemechek won the third race at Las Vegas.
Sauter recorded his first top five finish in 20 races. Prior to Saturday, his most recent was a fourth-place finish at Kentucky Speedway last July.
Hailie Deegan finished a season-best 21st on Saturday.
With two more stage wins on Saturday, Nemechek has now tied Rhodes with a series-best 10 playoff points through the season’s first four races.