The Olympic champion touched in a time of one minute 44.20 seconds, with Conor Dwyer of the United States taking silver in 1:45.32 and Russia's Danila Izotov bronze in 1:45:59.
Izotov edged American defending champion Ryan Lochte into fourth place, where he also finished in last year's London Olympics.
(Reporting by Iain Rogers, editing by Ed Osmond)
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