Thomson ReutersFebruary 24, 2013 12:32
* Hammer beats Trott in omnium to avenge Olympic defeat
* Botticher defeats Dmitriev to complete sprint double
* James wins last-event Keirin for her fourth medal (Updates after final race)
MINSK, Feb 24 (Reuters) - Britain's Rebecca James won the last event on the track for her fourth medal and second gold to become the most successful rider of the world cycling championships on Sunday.