Victoria Pendleton failed to qualify for the keirin final at the Track Cycling World Championships after finishing sixth in her second round heat.
The 31-year-old, who was seeking a second keirin title after her 2007 win in Palma, is racing in her final World Championships as she plans to retire after London and won her sixth sprint title on day three in dramatic and emotional fashion.
Pendleton progressed from the first round through the repechage and had to finish in among the first three riders in her second round heat to go through to the final.
The Briton followed an early move from Guo Shuang of China but was squeezed out of contention on the final lap as Clara Sanchez, Kristina Vogel and Guo went through.
Pendleton eventually finished in 12th place while gold was taken by defending champion Anna Meares of Australia.