Franklin took home five Olympic medals at the London games this past summer, including four gold.
Ronald Martinez/Getty Images

Olympic swimming champions Missy Franklin, Nathan Adrian and Katie Ledecky won races Thursday night in the Arena Grand Prix.

Franklin won the 100-meter freestyle, finishing in 54.27 seconds. Hungary's Katinka Hosszu was second in 54.60, and fellow Olympic gold medalist Natalie Coughlin followed in 54.61.

"I knew it was going to be a really hard race," said Franklin, set to swim three events Friday. "I'm thrilled with my time and am really happy where I am right now."

Breeja Larson, a Mesa native and 2012 Olympian, won the women's 200 breast in 2:28.03, and

B.J. Johnson took the men's race in 2:14.51.

Olympian Matt McLean won the 400 free in 3:51.95, Olympian Claire Donahue took the women's 100 butterfly in 59.58, and Poland's Marcin Tarczynski won the men's race in 52.83.

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