He's kind of a big deal.

The Cactus League is a spring training tradition for Major League Baseball. This year, fifteen teams are holding their practice games in the Phoenix area, and today, five of them will be featuring the same rookie player: 47-year-old, 115-pound* Will Ferrell. Ferrell will alternate positions until he eventually plays all nine, and is taking a helicopter between games to make sure he fits them all in. In addition to the Diamondbacks (as seen above), he's already suited up for Oakland, telling reporters he was in "beast mode."

Sources: AZ Central | The Chicago Tribune