The Padres are trying to fill their outfield holes by converting third base prospects:

Headley, 23, will be joined by Matt Antonelli, Scott Hairston and Chad Huffman for a series of drills this week as the club tries to convert its top position prospect.

The Padres' second-round selection in the 2005 amateur draft hit .330 with 20 homers and 78 RBIs last season at Double-A San Antonio and had two briefs stints with the Padres.

But with Kevin Kouzmanoff coming off a successful 2007 campaign, Headley's path to the majors is blocked. Additionally, the Padres lack a proven, everyday left fielder and seek an additional left-handed hitter -- Headley is a switch hitter -- for the lineup.

The organization is also toying with the idea of moving Antonelli to center field. The Padres used their first-round pick in 2006 to draft Antonelli, then a third baseman from Wake Forest. He was converted to second base last year.

The nice thing about being heavy with players at the defense end of the defensive spectrum is that it's easy to move them toward more offense minded positions.