Hungary's Katinka Hosszu underlined her status as the leading all-round swimmer with a world record in the women's 200 metres individual medley at the world championships on Monday.
Hungary's Katinka Hosszu set a world record for the women's 200 metres individual medley at the world swimming championships on Monday.
USA swimmer Michael Phelps wins men's 200-meter butterfly, his 20th Olympic gold.
Swimming authorities need to increase the number of doping tests to preserve the sport's credibility and stop fans turning away according to Britain's triple world champion and double world record holder Adam Peaty.