French sensation Leon Marchand started his quest for more Olympic history when he advanced into the semi-finals of the 200 metres butterfly and 200m breaststroke on Tuesday. No swimmer has ever won butterfly and breaststroke medals at one Games. According to the swimswam portal only one swimmer has actually managed to reach finals in both styles, American Mary Sears who won 100m butterly bronze and came seventh in 200m breaststroke in 1956. Marchand dominated the 400m medley on Sunday with the biggest winning margin in Olympic event history, 5.67 seconds. Conserving energy was the motto for hi…