For each slam, you get the date it was hit, and as extra help, you get the players who scored ahead of the slammer. You only have to enter a player's name once, to get credit for all their slams (one player has an impressive seven, no-one else has more than three), and last names only are fine.
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Your Saturday Sporcle: Arizona Slambacks
In honor of Alfredo Marte's pinch-hit grand-slam last night, how many of the other 58 grand-slams in D-backs history do you remember?