Playing in the Ryder Cup celebrity team the man with the most Olympic Gold medals was asked what he used for ball markers;

What does @m_phelps00 use for ball markers? ... #RyderCup

A video posted by PGA.com (@pgacom) on Sep 27, 2016 at 12:51pm PDT

And here he is mingling with fans

Michael makes some young fans' dreams come true! #RyderCup

A video posted by PGA.com (@pgacom) on Sep 27, 2016 at 1:31pm PDT

The Ryder cup starts Friday!