Ryan Murphy lost the second of his Rio backstroke titles to Russian Evgeny Rylov at the 2020 Olympics on Friday and the US swimmer then suggested doping had played a part in his demise as events took an acrimonious turn at the Tokyo pool.
The 18-year-old, who broke the world record in Saturday's 50m event, smashed his own world junior mark while winning the 100m final in a Russian senior record of 52.53 seconds.
The United States set a world record of three minutes and 50.40 seconds in the women's 4x100m medley relay final at the world championships on Sunday.
Mitchell Larkin completed a rare backstroke double and Bronte Campbell won the blue riband women's 100 metres freestyle title as Australia celebrated another golden night at the world swimming championships.
Poland's Magdalena Fularczyk-Kozlowska and Natalia Madaj edged past Britain's Katherine Grainger and Victoria Thornley in the final meters of the race to snatch the gold medal in the women's double sculls at the Olympic rowing regatta on Thursday. The nail-biter saw the two boats neck-and-neck for much of the race. Britain led Poland by just .64 seconds at the halfway mark and appeared poised to win.