Mercer's quick liner with one out in the seventh inning gave Jennings no time to react. The ball hit the side of Jennings' head, knocking the pitcher to the ground before it was caught by shortstop Adeiny Hechavarria. Jennings struggled, but got off the ground and walked a few feet before collapsing to his knees. He remained conscious, but seemed disoriented.
Jennings was taken off the field in a cart and waved to the crowd after he received a standing ovation.