"Seeking to avoid a "quarterback controversy" at first base, the Padres Friday morning moved first base prospect Anthony Rizzo to the Chicago Cubs for right-handed power pitcher Andrew Cashner.

Cashner and Rizzo are the featured players in a four-player trade.

The Padres got the 25-year-old Cashner and 20-year-old South Korean center fielder Kyung-Min Na in exchange for Rizzo and right-handed starter Zach Cates, who was the Padres third-round pick in the 2010 draft.

Cashner, whose fastball has been clocked at 100 mph, will be used as a "toward the end of the game" reliever in 2012, although the Padres believe his future could be in the rotation or as a closer.

He is a candidate this season for the eighth-inning setup role in front of closer Huston Street.

There is a risk with Cashner, who missed most of the 2011 season with a strained rotator cuff."