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Pittsburgh Pirates outfielder Gregory Polanco was held out of Saturday's lineup after suffering a hamstring injury during Friday night's game against the Chicago Cubs. 

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Pittsburgh Pirates outfielder Starling Marte, Cincinnati Reds outfielder Jay Bruce and San Diego Padres starting pitcher Drew Pomeranz were named to the National League All-Star roster as injury replacements, MLB announced Saturday.

Marte, Bruce and Pomeranz will replace the Chicago Cubs' Dexter Fowler and the New York Mets' Yoenis Cespedes and Noah Syndergaard.

Boston Red Sox closer Craig Kimbrel has been placed on the 15-day disabled list and will undergo surgery on his left knee, according to WEEI.com's Ryan Hannable.

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The Chicago White Sox placed starting pitcher Carlos Rodon on the 15-day disabled list Saturday morning because of a wrist injury.  

The Boston Red Sox announced the acquisition of relief pitcher Brad Ziegler from the Arizona Diamondbacks on Saturday in exchange for minor leaguers Jose Almonte and Luis Alejandro Basabe. 

The New York Mets pitching staff can't catch a break. All-Star Noah Syndergaard exited Friday's game against the Washington Nationals in the fifth inning with an apparent arm injury.

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The New York Mets offense has been dealt a blow with All-Star outfielder Yoenis Cespedes suffering an injury to his quad.  

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Minnesota Twins outfielder Byron Buxton suffered an apparent right knee injury when he crashed into the center field wall while trying to make a leaping catch during Friday night's game against the Texas Rangers.

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San Francisco Giants first baseman Brandon Belt and Toronto Blue Jays outfielder Michael Saunders won the final roster spots for the 2016 Major League Baseball All-Star Game on Friday. 

MLB's official Twitter account confirmed the news:   

Washington Nationals pitcher Max Scherzer will replace teammate Stephen Strasburg on the 2016 National League All-Star roster, MLB announced on Friday.

Scherzer, 31, is 9-6 with a 3.21 ERA and 0.97 WHIP through his first 18 starts. He's struck out 155 batters in 120.2 innings and will be making his fourth straight appearance in the Midsummer Classic.