Darren O'Day

is a relief pitcher for the Texas Rangers. O'Day used to be on the Angels, then the Mets, then was claimed off waivers by the Rangers. He is a right-hander, and he throws sidearm.

Song
At Rangers home games when O'Day comes in the fans sing:

O'Day, O'Day, O'Day, O'Day, O'Day, O'Day. (repeat)

This is known to Wakko as the O'Day song.