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Contreras hits 1st-inning slam, Cubs beat Pirates 9-0
Rarity of events in MLB games (individual, not team) : r/baseball
Mitch Haniger delivers winning run for Mariners on first pitch in bottom of 10th inning
A's beat Angels on walk-off grand slam - Yahoo Sports
Xander Bogaerts' walk-off grand slam lifts Red Sox over Blue Jays