In this feature, we'll outline whether teams should be buyers or sellers as the trade deadline approaches.

San Diego Padres: Sellers

Why: The Padres are in the middle of rebuilding. They are 30-50 and 15 games out of first place. Coming into the season, the Padres had the top farm system in the game, according to ESPN's Keith Law. Since many of Padres' top prospects are still a few years away from making an impact in the majors, the team should continue to bolster its young talent. 

Who can they deal: Chase Headley has already garnered a fair amount of interest on the market. The 28-year-old third baseman is off to a solid start, hitting .272/.371/.418. Headley could thrive in a different home ballpark. He's a .300/.366/.444 hitter away from Petco. Jon Heyman mentioned the Dodgers as a possible suitor. 

Carlos Quentin should also be on the move. Quentin has been exceptional after returning from a knee injury, batting .311/.441/.622 this season. He's a free agent at the end of the year, and it's unlikely the Padres will sign him to a long-term deal. The Blue Jays have shown interest in Quentin.

Huston Street was recently named to the All-Star team, but he could be on his way out of San Diego. The 28-year-old closer has a $9 million option for next season, but it's unclear whether the Padres would be willing to pick it up. He's been solid again this season, with a 1.29 ERA, and an equally impressive 1.25 FIP. There's a chance Street will be the best reliever on the market.

Who they should keep: The Padres have assembled a strong group of young players who the team should build around. Yonder Alonso and Yasmani Grandal, who were acquired in the Mat Latos deal, are unlikely to be moved. The team also will likely keep Andrew Cashner, who took a no-hitter into the sixth inning during his most recent start. 

Cameron Maybin and Cory Luebke were signed to contract extensions earlier this season. Luebke is currently injured, but was well on his way to a breakout performance this year. Maybin has struggled this season, but the team believes in his skills.

Verdict: Even with all their young talent, the Padres are still a couple years away from contending. They have some strong pieces to trade and a solid core to build around. They might be sellers now, but the team's future looks bright.