Ken Roczen suffered a major setback to his 2018 AMA Supercross championship hopes on Saturday night at Petco Park in San Diego. After qualifying third quickest and finishing fifth in his heat race, the 23-year-old Team Honda HRC rider was slowed initially in the 22-rider 450SX main event by a multi-rider first-turn crash.

Two laps later, attempting to pass Cooper Webb (Monster Energy/Knich/Factory Yamaha Team), Roczen lost control of his factory CRF450R in a left-hand turn and both riders hit the ground. Roczen emerged from the melee with a badly torn jersey and holding his right arm. Both riders were forced to retire from the race.

Webb's disappointment was palpable, but Roczen fractured the second metacarpal in his right hand. "I came into the corner with good speed," Roczen said, "got on the gas, and then caught a ton of traction in the rut, lost my balance, and whiskey-throttled the bike into Webb. My arm went in between his wheel and swingarm."

Surgery is scheduled for this Friday with Dr. Randy Viola. The Colorado-based surgeon performed all 11 of Roczen’s operations last year to repair a badly injured left arm—a compound fracture of the radius and a dislocated elbow and wrist—resulting from his season-ending crash at Angel Stadium in Anaheim, California. “We are going to get everything fixed up so I can get back out there as soon as possible,” Roczen said.

UPDATE: On Friday, Dr. Randy Viola operated on Ken Roczen at the Steadman Clinic in Vail, Colorado. According to a press release issued by Honda, the damage to Roczen's right hand was more extensive than the original diagnosis suggested. Viola plated and screwed the fractured second metacarpal, and repaired torn ligaments. In addition, he "cleaned up" a chip at the base of the thumb and hook of hamate (a wedge-shaped bone located near the bottom of the hand). Roczen is expected to out of action for 6-8 weeks.

Supercross heads east this weekend for the seventh round of the 17-race series at AT&T Stadium in Arlington, Texas. Riding the momentum of back-to-back victories, Jason Anderson (Rockstar Energy Husqvarna Factory Racing) leads Webb's teammate Justin Barcia by 28 points in the championship. With his DNF in San Diego, Roczen dropped from second to fourth overall.