Third-year pro Chris Alldredge sustained a broken collarbone in a practice crash this week and will miss Round 2 of Monster Energy Supercross in San Diego. No timetable for a return has been announced.

Transworld Motocross was the first to report the injury.

With Allredge out for at least the next few rounds, Barn Pros/Home Depot Yamaha has signed rookie Jon Ames to fill-in. Ames, a native of Arizona, qualified for his first career Monster Energy Supercross round at the 2017 opener last weekend at Anaheim. He finished 22nd after crashing in the main event.

The injury comes after Alldredge sustained a serious pelvis injury while with Monster Energy/Pro Circuit Kawasaki in Las Vegas last year. He missed most of Lucas Oil Pro Motocross before returning at Budds Creek for the final two rounds.

The Oregon native signed with Barn Pros/Home Depot Yamaha this off-season after two seasons with Monster Energy/Pro Circuit Kawasaki. At the season-opener at Anaheim, Alldredge failed to make the 250 main event.

[Update: Friday, Jan. 13]

We emailed Barn Pros/Home Depot Yamaha team manager Scot Steffy earlier today and he told us that Alldredge broke his collarbone on Tuesday and is scheduled to undergo surgery today (Friday, January 13) and the team is expecting him back for Oakland. “The entire team is bummed as he was really looking good on Tuesday and was determined to out it into the top 10,” Steffy said. 

He said they brought in Jon Ames on Wednesday to test the bike and he’s been great so far. He will debut this weekend in San Diego.