Great Britain's Becky James clinched her first world gold medal by battling back to beat Kristina Vogel in a see-saw sprint final.

The 21-year-old from Abergavenny lost the first race on the line but levelled in similar style and saw off the German in a tense decider.

James follows in the footsteps of six-time world champion Victoria Pendleton, who retired after London 2012.

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"It's unbelievable. I can't believe this has just happened to me"

Becky James

Olympic champion Jason Kenny crashed out in the men's quarter-finals.

Kenny was beaten 2-0 by former junior world sprint champion Sam Webster, who edged the first race after flying off the final bend.

Their second meeting was nowhere near as close, with the 22-year-old New Zealander opening up a huge gap on the last lap that the Bolton rider could not make up.

Fellow British sprinters Matt Crampton and Philip Hindes were eliminated earlier in the competition, so Britain will have no representatives when the event concludes on the final day of these championships on Sunday.

There was to be a much happier ending for James, however. A legend like Pendleton is a tough act to follow but the Welsh rider has stepped out of her shadow after coming to Belarus in the form of her life, and will go for gold again in the keirin on the final day.

She had demonstrated her belief and ability with third places in the team sprint and 500m time trial, as well as the manner of her faultless progress through the individual sprint rounds to reach the final.

James had been faster than Vogel all week but the German has more experience of the cat-and-mouse contests at this level, making it a fascinating match-up.

In the first race, James tried to lead it out to the line but her rival timed her attack perfectly and just nudged ahead before the line.

That left the Welsh rider needing to win the next race to force a decider, and she left herself a lot to do after Vogel escaped on the back straight but had enough in the tank to reel her in and get past before the finish.

There was more tension to come in the decider. Neither rider wanted to lead out but James attacked with a lap-and-a-half to go and held on for a famous victory.

She celebrated it with her grandparents, who had made the long trip to Belarus - a journey that certainly seems worthwhile.

"It's unbelievable. I can't believe this has just happened to me," a jubilant James told BBC Sport afterwards. "I'm world champion and I can't believe it!

"I didn't know if I'd run the first run quite right. We went over the tactics right after. I really wanted to win this so I sat down, kept myself calm and thought about what I wanted to do in the next round, did it and did it again in the third.

"I didn't think I'd get a single medal, I was hoping to get top eight in everything. I can't believe I got a rainbow jersey."

Elsewhere, Dani King, who was part of Britain's gold medal-winning team pursuit squad, finished eighth in the women's 25km points race.

Jon Dibben also ended up eighth overall in the six-event omnium in his first senior world championships.

The 19-year-old, who like King is from Southampton, started the day in 11th place at the halfway mark but moved up the standings after taking fifth in the individual pursuit and winning the 15km scratch race, before signing off with 12th spot in the 1km time trial.