- March 6
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- Marco Scutaro
- Marcus Giles
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- Marian (IN) Knights
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- Markham Township League
- Marlins' ballpark
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- Marty Barrett
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- Marva League
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- Maryvale Baseball Park
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- Masahiro Tanaka
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- Mascot
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- Massachusetts
- Massachusetts-Connecticut League
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- Massanutten League
- Massawippi Valley League
- Mat Gamel
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- Matsuzaka Generation
- Matt Adams
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- Matt Clement
- Matt Clement/Magazine covers
- Matt Garza
- Matt Gedman
- Matt Harvey
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- Matt Joyce
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- Matt Kemp
- Matt Kilroy
- Matt LaPorta
- Matt Lindstrom
- Matt Murton
- Matt Olson
- Matt Reynolds
- Matt Reynolds (infielder)
- Matt Shoemaker
- Matt Stairs
- Matt Stites
- Matt Strahm
- Matt Treanor
- Matt Tuiasosopo
- Matt Tupman
- Matt Vasgersian
- Matt Wieters
- Matt Williams (third baseman)
- Matt Wisler
- Matthew Beaver
- Matty Alou
- Maud Nelson
- Maumee Valley Baseball League
- Maumee Valley League
- Maurice Archdeacon
- Maurice Valley League
- Maury Wills
- Maury Wills/Magazine covers
- Mavericks Independent League
- Max Carey
- Max Fried
- Max Kepler
- Max Manning
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- Max Patkin
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- Max Williams
- May 1
- May 1, 1979 – Atlanta Braves vs. Pittsburgh Pirates
- May 10
- May 11
- May 12
- May 13
- May 14
- May 15
- May 16
- May 17
- May 18
- May 19
- May 2
- May 2, 1979 – Atlanta Braves vs. Pittsburgh Pirates
- May 20
- May 21
- May 22
- May 23
- May 24
- May 25
- May 26
- May 27
- May 28
- May 29
- May 3
- May 30
- May 31
- May 4
- May 5
- May 5, 2008 – Philadelphia Phillies vs. Arizona Diamondbacks
- May 6
- May 6, 2008 – Philadelphia Phillies vs. Arizona Diamondbacks
- May 7
- May 7, 1979 – Pittsburgh Pirates vs. Atlanta Braves
- May 7, 2008 – Philadelphia Phillies vs. Arizona Diamondbacks
- May 8
- May 8, 1979 – Pittsburgh Pirates vs. Atlanta Braves
- May 8, 2008 – Philadelphia Phillies vs. Arizona Diamondbacks
- May 9
- May 9, 1979 – Pittsburgh Pirates vs. Atlanta Braves
- Mazda Stadium
- McCurtain County League
- McDaniel Green Terror
- McHenry County League
- McKeesport Indsutrial League
- McKendree Bearcats
- McMurry War Hawks
- McNeese State Cowboys
- McPherson Bulldogs
- Medaille Mavericks
- Medicine Hat & District League
- Medicine Hat Industrial League
- Medicine Hat League
- Medina County League
- Meiji Jingu Stadium
- Mel Allen
- Mel Ott
- Mel Parnell
- Melfort Town League
- Melky Cabrera
- Melrose League
- Melvin Mora
- Melvin Upton Jr.
- Memorial Stadium (Baltimore)
- Memphis Redbirds
- Memphis Tigers
- Mendocine-Lake County League
- Mendoza line
- Menlo Oaks
- Merced County League
- Mercer Bears
- Mercer County League
- Merchant Marine Mariners
- Mercy Mavericks
- Mercyhurst Lakers
- Meridan League
- Meriden Factory League
- Meriden Twilight League
- Meridian League
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- Merkle's Boner
- Merrimac Valley League
- Merrimack Valley League
- Merrimack Warriors
- Mesa State Mavericks
- Mesquite League
- Messiah Falcons
- Methodist Monarchs
- Metro & District League
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- Metropolitan League
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- Mexico
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- Micah Owings
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- Michael Jordan
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- Michael Young
- Michigan-Indiana League
- Michigan-Ontario League
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- Michigan State Spartans
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- Mickey Cochrane
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- Mid-America Christian Evangels
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- Mid-State League (Ia)
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- Mid-West League (SK)
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- Mid Island Japanese League
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- Middle Atlantic Conference Commonwealth
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- Middle finger
- Middlebury Panthers
- Middlesex-Lambton League
- Middlesex County League
- Middlesex County League (NY)
- Middlesex Inter-Park League
- Middlesex Valley League
- Middletown City League
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