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Prado has been incredibly valuable for Kirk Gibson's squad, spending time at 2B, 3B, SS and LF at various points during the season.
Best Buy: IF/OF Martin Prado
It took a few months for his bat to get going, but Martin Prado has been every bit as versatile and valuable an addition for the Diamondbacks as we thought he'd be when Arizona acquired him from Atlanta as part of the Justin Upton trade last winter.
The Senior Circuit's hottest player since the All-Star break, hitting .368/.420/.564 with 21 extra-base hits (five home runs) and 38 RBI, the four-year, $40 million contract extension that Arizona signed him to before the season is beginning to look like a steal.
Defensively, Prado has been solid, though he's taken a step backwards from 2012, when I made him my choice for a Gold Glove Award in left field with the Braves.
Worst Buy: RHP Brandon McCarthy
When Arizona signed Brandon McCarthy to a two-year, $15.5 million deal this past winter, the first reaction of many baseball fans was "Wow, what a great deal for the D-Backs."
It turns out that we may have jumped the gun on that.
The Diamondbacks have gotten a 3-9 record, a career-worst 4.94 ERA and only 17 starts for their money this year. Of those starts, McCarthy has only pitched into the seventh inning six times. It's no surprise that his opponents in those games—the Marlins, Mets, Phillies and two against the Padres—own some of the weakest lineups in baseball.
That's the good news.
Against teams with legitimate major league offenses, McCarthy has been awful, pitching to an 8.02 ERA and 1.87 WHIP in his other 11 starts on the season Three times he couldn't get through five innings of work, and in only three of those starts has he allowed fewer than four earned runs.
With $9 million coming his way in 2014, Arizona couldn't move him if they wanted to. At this point, all the team can do is hope that McCarthy has hit rock bottom and that some time away from it all after the season will get the 30-year-old right-hander back on track.