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The NL East rivalry between the Washington Nationals and the Philadelphia Phillies doesn't involve just the players—it extends to the mascots as well.

Before Tuesday night's game, Nationals star Bryce Harper pulled a prank on the Phillie Phanatic, stealing the keys to the mascot's ATV. That got the fun started.

New York Yankees slugger Alex Rodriguez has been diagnosed with a bone bruise in his left knee after undergoing an MRI on Tuesday.

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The San Francisco Giants' chances of making the postseason are slim enough as is, and they won't improve with news of an injury to Joe Panik.

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Houston Astros outfielder Carlos Gomez will be out of the lineup against the Los Angeles Angels with an injury near his ribs. 

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Gomez Scratched Due to Discomfort

Sunday, Sept. 13

According to the Astros' official Twitter account, Gomez is dealing with "intercostal discomfort" and is listed as day to day.

Corey Seager may be the Los Angeles Dodgers' top prospect, but he's still just a rookie.

That means his teammates are going to mess with him when they get the opportunity. Saturday night was the perfect example.

Kansas City Royals third baseman Mike Moustakas' breakout 2015 season hit a new high on Saturday against the Baltimore Orioles as he went 3-for-5 with two home runs and a career-high nine RBI in a 14-6 victory.

In addition to Moustakas setting a new single-game benchmark for runs driven in, Joel Goldberg of Fox Sports Kansas City noted the other marks the 27-year-old broke or tied:

Boston Red Sox designated hitter David Ortiz became the 27th member of the 500-home run club against the Tampa Bay Rays on Saturday.

Ortiz's second home run of the game pushed the 39-year-old into the distinguished club, as MLB noted:

Washington Nationals reliever Drew Storen has suffered a broken thumb and will be out for the rest of the 2015 MLB season.

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Toronto Blue Jays shortstop Troy Tulowitzki exited the field in the first game of Saturday's doubleheader against the New York Yankees with bruises to his upper back and a small crack in his scapula, according to Gregor Chisholm of MLB.com, who also repo

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