Defending Monster Energy Supercross 450SX champion Cooper Webb will not line up this Saturday in St. Louis, a practice crash on Wednesday sidelining him ahead of round 13.

Webb has suffered a challenging title defense, yet to score a main event victory and has experienced a share of troubles throughout the season, including a costly mistake that resulted in a race-ending collision in Detroit.

While Webb underwent further scans on his shoulder and hand following the collision at round 10, he still lined up the following Saturday at Indianapolis, meaning the event in The Dome at America’s Center will be the first he has missed in its entirety this season.

“Not the news I wanted to share – I had a practice crash on Wednesday and will be sitting out St. Louis this weekend,” Webb confirmed. “A tough few weeks, but we’ll be back. Going to rest up and hope to see y’all in ATL.”

No further update or insight into Webb’s condition has been provided. The two-time 450SX championship winner is currently fifth in the point-standings with five rounds remaining.

If the Red Bull KTM Factory Racing rider can make a return at Atlanta, he will have four races left to score a victory in his title defense, having stood on the podium four times this season – three of those times in the runner-up position.