April 30, 2002: Al Leiter becomes first pitcher to beat all 30
just four teams
Why don't MLB pitchers mix in a few slow pitches from time to time
OTD 2002: Leiter Becomes First to Beat All 30 Teams - Metsmerized
Former MLB pitcher Al Leiter gives back to his alma mater
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What mlb pitcher had the slowest fastball but was a rotation
John Lackey – Society for American Baseball Research
Former MLB pitcher Al Leiter gives back to his alma mater
Al Leiter - Wikipedia
This Date In Mets History: April 30—Al Leiter defeats his 30th
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Amazin' Memories: Al Leiter First to Beat All 30 Teams
Al Leiter- The Mets Years / 2000 NL Champion (1998 - 2004)