Cambridge BMX rider Sarah Walker is on track for the UCI Supercross World Cup title, after topping the time trials in the final round in Southern California.
The 22-year-old from Cambridge comes into the fourth and final round at the US Olympic Training Centre at Chula Vista with a substantial lead and a strong showing in the time trials has given her a claw grip on the title.
Fellow Cambridge rider Marc Willers withdrew after his warm-up, following a nasty crash in practice on Friday.