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Gutierrez homered in a 1-0 game in the bottom of the 8th inning, changing the score from 1-0 (odds of a Mariner victory this late in the game: 14%) to 3-1 (odds of the Mariners winning this late in the game: 96%). In one swing, Gutierrez produced 82% of a win. He could have struck out in 40 consecutive at bats thereafter and he'd probably still have a positive WPA.