Trott facing omnium test

Olympic champion Laura Trott was facing a battle to win Great Britain's fourth gold of the Track World Cup in London after her lead was reduced entering the final event of the women's omnium. Trott, who won gold in track cycling's equivalent of the heptathlon at London 2012, had 186 points after five of the six disciplines at the Lee Valley VeloPark, formerly the Olympic Velodrome.

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