Ryan Lochte
Courtesy of: Azaria Basile
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MESA, Arizona, April 26. The two top personalities here in Mesa at the Arena Grand Prix wound up not swimming on the final night. Michael Phelps planned on taking the day off, while Ryan Lochte just became a late scratch for finals.

SwimMAC head coach David Marsh tweeted out that he pulled Lochte out for the night for "precautionary reasons" because Lochte "didn't feel right in warm up."

Lochte confirmed the news on Twitter a few minutes later.

During a quick media scrum during finals, Marsh explained that Lochte was having some knee issues, as Lochte continues to try to return from his December 2013 knee injury.

Video interview: