What is a walk-off in baseball? How Diamondbacks' Ketel Marte made history with NLCS hit

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Marte hits walk-off single in ninth, D-backs beat Phillies 2-1 and close to 2-1 in NLCS

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Ketel Marte's walk-off single puts D-backs over Phillies 2-1 in NLCS

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Ketel Marte hits walk-off single in 9th, D-backs beat Phillies 2-1 and close to 2-1 in NLCS

D'Backs Infielder Moves Up the Playoff History Books in Friday's Wild Game 4 Win - Fastball

Thomas' tying homer, Moreno's decisive hit send D-backs over Phillies 6-5, ties NLCS at 2 games

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