how will a red sox catcher make mlb history by playing for both teams in one game ?

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How will a red sox catcher make MLB history by playing for both teams in one game?
Red Sox manager Alex Cora confirmed Friday that Jansen will be in Boston's lineup when the game is rescheduled, meaning he'll be behind the plate as the catcher while the Blue Jays assign a pinch-hitter to take his place in the batter's box.