(CBS) As the Cubs sit in the second wild-card spot as they open up the second half of the season Friday, they continue to monitor the trade market in hopes of acquiring a starting pitcher, which management has freely admitted they must do to put themselves in position to be a true contender in 2015.

The problem is the player they would seemingly be willing to part with is drawing little interest from others.

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The Cubs are finding that few teams are interested in shortstop Starlin Castro, ESPN’s Tim Kurkjian reported. Though Castro is a 25-year-old three-time All-Star, he’s hitting just .247 (two points away from his career-worst mark) with a career-high .604 OPS and a -0.3 WAR. He’s also struggled defensively for long stretches.

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The performance appears to have greatly diminished his trade value, and it all adds up to uncertainty for the Cubs, who must balance a desire to be aggressive with a desire to protect the future — such as hanging on to rookie middle infielder Addison Russell, who they are high on.

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From Kurkjian:

“They are a year ahead of schedule in their plan to contend. With a shot to make the playoffs, look for them to be aggressive and try to add a pitcher — maybe even a big-name guy — Cole Hamels or Johnny Cueto — for the stretch run. Ideally, they could trade shortstop Starlin Castro as part of a package, then move second baseman Addison Russell to shortstop, where he belongs, and hope that second baseman Javier Baez is ready to be promoted from Triple-A. But there doesn’t appear to be a market for Castro. And from all indications, the Cubs will not mortgage their future by dealing any of their best young players.”