By Stephen Eisenhammer RIO DE JANEIRO (Reuters) - Britain's Jason Kenny won the men's track cycling keirin on Tuesday, taking his gold medal haul to six and equaling Chris Hoy's record for the country's most Olympic titles. In a tense race around Rio's boards, Kenny had too much pace down the final stretch, recovering from a slow start to finish just clear. After taking gold, Kenny embraced his fiancee and fellow gold medal winner Laura Trott, who was in tears in the center of the track. More...