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Jeremy Hefner, RHP, Mets (20.7 Percent Owned)
All the 27-year-old has done in his past nine starts is go 4-1 with a 2.09 ERA, 1.09 WHIP and a 7.9 K/9. Once an NL-only play, Hefner has become spot-starter material.
Felix Doubront, LHP, Red Sox (4.7 Percent Owned)
Doubront, 25, doesn't always do it pretty, but he gets his whiffs (8.5 K/9) and has allowed more than two earned runs only twice in his past 10 outings—and those were three earned runs both times.
Gordon Beckham, 2B, White Sox (9.6 Percent Owned)
In his 30 starts since missing most of April and all of May with a broken hamate bone, the 26-year-old Beckham (pictured) is hitting .345/.373/.451. You can use him at second base or middle infield while he's hot.
Darin Ruf, 1B/OF, Phillies (0.3 Percent Owned)
As a 25-year-old in Double-A last year (read: fringe prospect), Ruf bashed 38 homers to lead the minors—then hit three more in a September cup of joe with the Phils. He only had seven at Triple-A so far this year, but with Ryan Howard out, the recently-called-up Ruf will get some action at first.
Grant Green, 2B/SS, Athletics (0.6 Percent Owned)
The A's first-rounder in 2009 has hit every step of the way in the minors (.305/.353/.468 career) and reportedly is close to getting called up for his debut, according to Susan Slusser of the San Francisco Chronicle. There may be sneaky middle infield value here for AL-only formats or deeper mixed leagues.