“I remember when I hit as a pitcher, he was probably the toughest at-bat that I had faced," Gallen said of Wheeler.
Zack Wheeler blossoms into ace for Phillies, gets Game 1 start against Arizona in NLCS
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Gallen said he learned of the starting assignment last Wednesday from Arizona manager Torey Lovullo.
Yankees' Gerrit Cole and Diamondbacks' Zac Gallen to start MLB All-Star Game
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