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Basbeball Prospectus Odds report
67% chance of a 2 way tie, 17% chance of a 3 way tie, 5% chance of a 4 way tie. No mention of the 5 tie, probably so slim it's negligible.
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Well if you assume every team is 50/50 to win each game, the odds of the Mets/Phillies/DBacks/Padres/Rockies tying at 89-73 is (1/16)^4