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Simulated great white beats Michael Phelps in "Shark Week" race

Michael Phelps (L) of the United States leads Chad le Clos of South Africa in the Men's 200m Butterfly Final on Day 4 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on Aug. 9, 2016 in Rio de Janeiro, Brazil.

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Even Michael Phelps can't out-swim a "great white shark."

The Olympic champion swimmer was bested Sunday night in the Discovery Channel's Shark Week special "Phelps vs. Shark: Great Gold vs. Great White."

But Phelps didn't swim with a real shark. He competed in the ocean against a computer-simulated fish based on data on the swimming speed of sharks.

Phelps was outfitted with a wetsuit and a monofin to mimic a shark's powerful tail. He finished the 100 meter race in 38 seconds, two seconds slower than the simulated shark.

Phelps tweeted Sunday that he'd like a rematch, but in warmer water.