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MIAMI BEACH (CBSMiami) — Tennis superstar Serena Williams was spotted foot-faulting during her charity run over the weekend.

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Her Live Ultimate Run on South Beach kicked off Sunday morning at Lummus Park and benefited the Serena Williams Fund.

The race was 5 kilometers, or just a little more than 3 miles, but Serena couldn’t actually finish the entire run and hailed a taxi to take her the rest of the way.

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The Daily Mail tweeted out a few photos showing Serena getting out of the cab.

On Facebook, Serena vowed she’d finish the race next year.

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On Monday, Serena Williams was announced as Sports Illustrated’s Sportsperson of the Year and was featured on the magazine’s cover. She won 53 matches this year and three Grand Slam titles.