Defending champion Becky James required a second opportunity to advance to the women's Keirin semi-finals on the fifth and final day of the Track Cycling World Championships in Cali, Colombia.
James, who won sprint and Keirin gold in Minsk 12 months ago, appeared to win her heat but was relegated for leaving the sprinters' lane, sending her into the repechage.
Two riders progressed from the second-chance saloon and the 22-year-old from Abergavenny finished behind Anna Meares of Australia to go through.
James' team-mates Jess Varnish and Vicky Williamson also fell into the repechage heats.
Varnish was second to Mexico's Daniela Gaxiola to join James in the semi-finals, but Williamson finished fifth and was eliminated.
Olympic champion Laura Trott was in silver medal position with two events to go in the women's omnium, with Sarah Hammer of the United States having a seemingly unassailable seven-point lead.
Trott, who won the world title in 2012 and claimed silver to Hammer last year in Minsk, was six points behind overnight and the American extended her lead by winning the fourth event, the three kilometres individual pursuit.
Hammer, second to Joanna Rowsell in the individual event, clocked three minutes 32.761 seconds to Trott's 3mins 33.885secs.
With the scratch race and 500metres time-trial remaining, Hammer has five points and Trott 12.