Cishek has struggled this season -- 4.91 ERA, four losses and 26 runners allowed in 18 1/3 innings -- so the Fish will give more chances to veteran Chad Qualls and left-hander Mike Dunn.
Cishek, who saved 15 games and posted his second straight ERA under three a year ago, has been the subject of potential summer trade talks, but if he's not closing games his value isn't likely to be optimal.
Stay tuned.
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Part of the reason for a slim-or-none market is that it's May, and with two Wild Card berths in each league, more teams are still within shouting distance. The Braves, however, are in the market for a southpaw, with both Jonny Venters and Eric O'Flaherty out for the year with torn elbow ligaments.
Possibilities include Scott Downs of the Angels and Mariners' southpaw Oliver Perez, both of whom are set for free agency following the season. White Sox lefty Matt Thornton could also be available if the White Sox fail contend beyond the All-Star break.
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Hart could start a rehab assignment in the next week or two, suggesting he could return to the active roster sometime in June.
The veteran is scheduled to become a free agent after the season, providing two reasons for him to get back in the lineup and perform well. Hart needs to reestablish his stock as a player for next contract as well as the chance that the club could trade him this summer.
It's very possible that his recent battles with injury have decimated Hart's trade value so much that it may make more sense for GM Doug Melvin to keep the 31-year-old. But if he performs well for a month or six weeks before the deadline, anything is possible, especially considering the likely lack of available hitters this summer.
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The Pirates tabbed right-hander Gerrit Cole with the top pick two years ago and the UCLA product started this season in Triple-A Indianapolis with a chance to hit the majors sometime in 2013.
In nine starts, Cole is 3-2 with a 3.75 ERA and a 35-23 K/BB ration in 48 innings. He'd held batters to a .214 average, but the walks have contributed to the inconsistent outings, likely prolonging his stay in the minors.
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M's alternatives to Ryan 

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More extensions for pre-arb players? 
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Rickie Weeks, 2B -- Milwaukee Brewers: .127/.262/.182, 18 G
Weeks has just one extra-base hit this month and has struck out 17 times in 65 plate appearances.
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