Numbered Lists: Rare Baseball Feats

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Tonight has gotten me thinking of rare baseball feats. How about these one-time feats in MLB history?
1. Back-to-back no hitters – Johnny Vander Meer, Cincinnati Reds, June 11-15, 1938.
2. Two triple plays in one game – Minnesota Twins, July 17th, 1990.
3. Triple play without the bat touching a ball – Seattle Mariners, September 2, 2008.
4. Walkoff Inside-the-Park Grand Slam – Roberto Clemente, July 25, 1956.
5. Unassisted Triple Play in the World Series – Bill Wambsganss, Game 5 of the 1920 World Series.