In the first inning of Monday's Boston Red Sox-Toronto Blue Jays contest, Josh Donaldson's big swing ended with him losing control of the bat and releasing it into the back of umpire Chris Segal's head:
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Segal was thankfully able to get up and continue to call the game despite the vicious injury. Donaldson struck out on a foul tip.
The Blue Jays went on to score twice in the top of the first.