Ashley Fiolek suffers concussion

Defending 2009 and 2010 Moto X Racing Women's champ Ashley Fiolek was knocked unconscious in practice Saturday and will miss finals at X Games 17, according to her father Jim Fiolek.

Fiolek, 20, crashed in practice and was knocked unconscious for approximately 20 seconds. She was hoping to compete regardless but has pulled out on the advice of X Games medical staff, her parents and her Honda team manager, due to an increased risk of post-concussion crashes, her father told ESPN.com.

"She wants to ride, but as parents we need to think about her safety and we, along with her Honda team manager, decided to pull her from the race tonight," Jim Fiolek said.

Fiolek will instead focus on recovering in time for the three remaining stops of the AMA Women's Motocross Championship, which continues on Aug. 27 in Southwick, Mass.

That could leave an opening for Jessica Patterson: The two riders have been dominating women's competition over the last few years, trading the top podium spots back and forth in what has become one of the biggest rivalries in motocross. Fiolek is currently ahead of Patterson in the AMA rankings.