Each team enters the exchange deadline with a wish list. No one gets everything they want, even if it may seem that way in San Diego right now.

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No composition is perfect. Even at the most powerful clubs, there are always holes, little problems that the front office and the manager have to deal with, game after game.

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Let’s dive into some of these potential pain points by focusing on the contenders. We will use some basic criteria: if a opposing team has a group of positions that, according to bWAR, performed at least half a standard deviation below the average, and plans to continue at this level until the end of the season, they may be on this list.

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Below are the holes in the roster that could have the biggest impact on the title chase, with some possible solutions. Positional rankings are listed for each location: the current season and a prediction based on baseball-reference.com’s WAR for the current season and Fangraphs predictions for the remainder of the season.

Chicago White Sox

Problem situation: Second base (19th season to date, 28th remainder of the season)

Chicago’s lack of action on the deadline was worrying, although it may have been more a reflection of how thinned his system was than a lack of motivation to improve the roster. There is no position where the White Sox need more upgrades than second base, where their forecast for the rest of the season is 1.6 standard deviations below average. Congratulations: this is the biggest positional hole in the opposing team.