By Sam Bush

Phils manager Joe Girardi had a feeling about Luke Williams.

So he penciled the rookie utility man fresh off helping Team USA qualify for the Olympics into the lineup in centerfield.

But with the Phillies down to their last out and with baserunner Andrew McCutchen on base, even Girardi was floored when Williams jacked a hanging slider over the left-field fence for a walk-off homer and a stunning 2-1 win over the Atlanta Braves Wednesday at Citizens Bank Park.

Click to watch.