The 19-year-old, who has already been a part of the victorious team pursuit squad, held a two-point lead over Australia's Annette Edmondson in the multi-event discipline and rounded things off in style by winning the 500 metres time trial.

Trott and Edmondson went head-to-head on the track in the final heat of the two-lap race and Trott finished first in 35.173 seconds to earn overall victory by three points.

She had also finished ahead of her nearest rival Edmondson in the scratch race earlier in the evening to take a big step towards her eventual success at the Hisense Arena.

Trott edged out the Australian by one position to move two points clear going into the concluding time-trial.

In other action, defending champion Jason Kenny had to settle for sprint silver as he lost in the men's sprint final to Gregory Bauge of France.

Bauge easily took the first race of the best-of-three showdown but was put on the back foot in the second as the British rider took a huge gamble.

Relegated

The 24-year-old opted to go at full speed from the start and held on to take the win, but he was subsequently relegated for straying outside the sprinters' lane on the final bend.

That handed the gold medal to Bauge, with Sir Chris Hoy claiming the bronze medal after beating Australia's Shane Perkins 2-0.

Kenny had already stated his case for Olympic selection by defeating fellow Brit Hoy in the semi-finals of the men's sprint.

Just one of the two, who took gold and silver four years ago in Beijing, will be able to represent Britain in the event at London 2012 under the one rider or team per nation per event rule.

Prior to the World Championships the team-mates and room-mates both indicated their belief that what happened in Melbourne would have a significant bearing on who would go to the Olympics.

And it was Kenny who in the end claimed a comfortable victory, winning the best-of-three showdown 2-0 to book a spot in the final against France's Gregory Bauge.

Bauge, the 2009 and 2010 world champion who was stripped of last year's title for an anti-doping offence, was an easy winner over Perkins in his semi-final.

Pendleton eliminated

Victoria Pendleton, who won her ninth World Championships title on Friday, failed to qualify for the keirin final.

The 31-year-old came through the repechage to reach the second round but could only manage fifth place next time out.

Pendleton forced the pace after the derny had pulled off but faded away on the final lap as Clara Sanchez, Kristina Vogel and Shuang Guo went through.

Defending champion Anna Meares of Australia, China's Di Mu and Ekaterina Gnidenko of Russia progressed to the final from the first second-round heat.

Ben Swift claimed his second medal of the World Championships with silver in the non-Olympic points race to add to his gold in the scratch.

In a pulsating finish, Swift won the final sprint but finished second after Australia's Cameron Meyer spectacularly gained a lap on the field late on to win from the Briton by 33 points to 32.