Ranomi Kromowidjojo of the Netherlands won gold in the women's 50 metres freestyle at the world swimming championships on Sunday.
Cate Campbell of Australia won gold in the women's 100 metres freestyle at the world championships in Barcelona on Friday.
Australia won gold in the women's 400-metre freestyle relay, setting an Olympic record of 3 minutes, 33.15 seconds on Saturday night. The Netherlands won silver in 3:33.79 while the US slipped to the bronze in 3:34.24.
A look at the highs and lows in the swimming events at the London Games.
Denmark's Pernille Blume beat the favorites to win the 50 meters freestyle in 24.07 seconds on Saturday and give her country a first Olympic swimming gold medal since 1948.
Dutch swimmer Inge Dekker, who was diagnosed with cervical cancer in February and had surgery in March, will take part in her fourth Olympics after being named on Tuesday in a 17-strong squad for next month's Rio Games.
Dressel had already won three individual golds and three relay titles in Budapest and Sunday's addition allowed him to match his compatriot Phelps's tally from the 2007 championships in Melbourne.
Chad Le Clos took his fourth gold medal in Doha on Sunday and became the first male swimmer to win all three butterfly distances in a single world short-course swimming championships.
Australia's women, powered by sisters Bronte and Cate Campbell, beat the United States and Canada to win the Olympic 4x100 metres freestyle relay in world record time on Saturday, retaining the title they won in London four years ago.
Missy Franklin surprised herself by going second-quickest behind Australia's Cate Campbell with a personal best in the heats for the women's 100 metres freestyle on Thursday as the American teenager chases a fourth world championship gold of the week.
Canadian Penny Oleksiak and Simone Manuel of the United States were inseparable at the finish and even more united in joy after a stunning 100 metres freestyle dead-heat rewarded both with Olympic gold on Thursday.
Ferry Weertman of the Netherlands won the men's marathon swimming event off Rio's Copacabana Beach on Tuesday in a race so close that he did not realise he had won until a friend called from home to give him the good news.