Pirates' Ke'Bryan Hayes calls for robo umps after missed call
Ke'Bryan Hayes voices frustration with umpires on Twitter after
Pirates' Ke'Bryan Hayes calls for robot umps after bad call - ESPN
Pirates star calls out umpire, pleads for ABS system
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Pirates 3B Ke'Bryan Hayes calls out umpire, pleads for robot
Pirates rookie Ke'Bryan Hayes called out on home run after missing