France's Leon Marchand cruised to a dominant world 400m individual medley world title on Sunday to claim his second gold...

Leon Marchand said on Saturday that he still has "a lot to do in the swimming world" a year on from his sensational home Olympics in Paris.

Leon Marchand won all four of his individual races at the Games -- the 200m butterfly, 200m breaststroke and 200m-400m medley double.

Leon Marchand called it a "perfect week" after winning his fourth gold of the Paris Olympics with an emphatic victory in the 200m individual medley on Friday in front of an ecstatic home crowd.

France's golden boy Leon Marchand returns to the pool Friday seeking a fourth swimming title at the Paris Olympics

The back-to-back golds made Marchand the first swimmer to win the 200 fly and breaststroke in the same Olympics.