Michael Phelps won the 18th gold of a mind-boggling career in the 4x100 metre medley relay on Saturday, retires with twice as many golds as any other Olympian.
'I don't think anyone at FINA is going to stand up for the athletes so the athletes have to stand up for themselves'
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.
Sun Yang became the first Chinese swimmer to win the Olympic men's 200 metres freestyle gold medal on Monday.
Britain's James Guy held off a host of Olympic champions to win his first world title, the men's 200m freestyle, at the world championships on Tuesday.