Biggest defensive holes on contenders and possible trade fits

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With the All-Star break behind them, teams are down to two weeks to improve their rosters before the July 31 trade deadline. The second wild card in each league and general parity throughout baseball will make this trade season a seller's market, but while most teams will be unable to acquire star players, there are still ways teams can improve.

One such avenue is on the defensive side. Many contending teams have notable defensive holes, and most of them can make a difference with smaller moves to target those deficiencies.

Let's look at the biggest defensive holes:

San Francisco Giants
Defensive hole: Center field
Current starter: Angel Pagan

Hamstring and disc injuries limited Pagan to 167 games between 2013 and 2014, and though he has played in 82 games so far this season, his production is not what it was in his peak seasons. Perhaps those injuries have taken their toll, or perhaps it's age-related decline for the 34-year-old center fielder. Either way, his .304 on-base percentage (OBP) and zero home runs make him a liability to the team, offensively, and he has been a below-average defensive center fielder each of the past five seasons and has already cost the team 11 runs this season, according to Defensive Runs Saved (DRS).

Pagan is signed through the 2016 season, so the Giants might not want to give up on him entirely. But it could be time to think about moving him to a less-demanding defensive position, such as right or left field, especially with the injury problems Nori Aoki and Hunter Pence have had this season.

Possible trade fits: Ben Revere, Phillies (+3 DRS in 2015); Sam Fuld, Athletics (+1 DRS in 2015, +5 DRS in 2014)

Pittsburgh Pirates
Defensive hole: First base
Current starter: Pedro Alvarez