LONDON, Aug 7 (Reuters) - The United States' Sarah Hammer
grabbed the psychological advantage over Britain's Laura Trott
thanks to a scorching pursuit victory that gave her a one-point
lead in the women's Olympic track cycling omnium on Tuesday.
Hammer, the world record holder and four-times world
champion in the individual pursuit, lived up to her top billing
to beat Trott into second place by almost a second.
Trott, who is bidding for her second gold of the Games after
winning the team pursuit, has two races remaining in the
six-discipline omnium to turn the tables.
Canada's Tara Whitten is in the bronze medal position, seven
points adrift of Trott, with the 10kilometre scratch race and
500 metre time trial to come later on Tuesday.
(Reporting by Toby Davis; editing by Mark Meadows)