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Overbay is only a fair hitter for a first baseman, but will be an upgrade on Clement both offensively and defensively.
After being acquired for longtime shortstop Jack Wilson in 2009 as part of a seven-player deal, Clement was given a scholarship to start the year at first base by general manager Neal Huntington. The knock on Clement going into the season was that, as a former catcher, he would be unable to adjust to play first base at an acceptable level.
Clement surprised, though, and handled the position well. The crashing and burning of his career came at the plate, where Clement showed decent power but struck out in over a quarter of his at-bats, supplementing the strikeouts with a microscopic walk rate. He played below replacement level before being removed from the lineup a quarter of the way through the season.
Overbay was signed to a one-year deal worth $5 million during the offseason. He's below average offensively for a starting first baseman in the Majors, but he's unlikely to be nearly as bad as Clement. He offers plus-defense that Clement could not, is a good bet for 20 home runs, and walks at a more respectable clip than Clement did. That said, it's a certainty that he'll be far outdone by fellow NL Central first basemen, guys with names like Pujols, Votto and Fielder.
Analysis: Overbay is a legitimate big leaguer, while Clement was not. He's a fairly substantial upgrade, even if not a long term answer at the position.