Hungary's Katinka Hosszu also grabbed the headlines by clinching gold in four events (200m free, 50m back, 200m IM), 800m) and silver in the 100m fly and 200m backstroke.
50m breaststroke World Record holder Cameron Van der Burgh of South Africa was absent on Tuesday night, but his countryman, Roland Schoeman, represented the nation in this event by ranking fourth. The winner of the event was Felipe Lima (BRA, 26.02), who also won the race last weekend in Beijing.
Schoeman took second place in the 50m butterfly, which was won by Le Clos as expected.
Le Clos, the South African champion, who with his two Rio Olympic silver medals (100m fly and 200m free) became South Africa’s most decorated Olympian in history, impressed in Dubai by grabbing gold in the 200m fly in 1:49.71.
This was Morozov’s 12th victory in this event.
Morozov claimed another victory (100m IM) on day one in Dubai, as well as one silver medal in the 50m breast.
Pavel Sankovich (BLR) dominated the 100m back in 50.20, defeating the most successful swimmers in this particular event, Bobby Hurley of Australia (silver) and Russia’s Stanislav Donetc, who did not make it to the Top 3.
However, Hurley was the fastest in the 400m free race and secured the title in 3:41.94. South Africa's Myles Brown, first last weekend in Beijing, touched the wall after him (3:41.3) in front of Great Britain’s James Guy.
Marco Koch gave Germany their first medal of the meet in the 200m breast in 2:03.41. The German has now won this event 11 times at the World Cup.
Philip Heintz brought home a second medal with the 100m IM (silver) and a third one with the 400m IM, also silver.
The final race of the day, the men’s 400m IM, was won by Beijing’s winner Daiya Seto of Japan in 4:00.93.
Having already impressed in the opening four legs in Paris-Chartres, Berlin, Moscow and Beijing, Hosszu claimed gold in the 200m free (1:54.37) and the 50m back (26.35) in Dubai.
The Hungarian star also added the 200m IM (2:05.87) and the 800m (8:27.45) titles to her medal tally.