The record for a player is 5, both Stan Musial (May 2, 1954) and Nate Colbert (August 1, 1972) hit 5 home runs in doubleheaders. The record for the enitre Major Leagues Is 62: On July 2, 2002, teams combined to hit 62 long balls breaking the one-day Major League record for home runs. The previous record was 57 and it was set on April 7, 2000. Here are the players who contributed to this record setting / historical day: American League Contributions Cleveland vs New York 01 Lawton (9, 1st inning off Clemens, 0 on, 0 out). 02 Thome (25, 1st inning off Clemens, 1 on, 1 out). 03 Posada (14, 7th inning off Riggan, 3 on, 2 out). Toronto vs Boston 04 Cruz (12, 7th inning off Kim, 0 on, 0 out). Tampa Bay vs Texas 05 McCarty (2, 6th inning off Rogers, 0 on, 2 out). 06 Gonzalez (5, 2nd inning off Sturtze, 0 on, 0 out). 07 Palmeiro (18, 4th inning off Sturtze, 0 on, 0 out). Detroit vs Chicago 08 Young (7, 1st inning off Ritchie, 0 on, 2 out: 1 of 2). 09 Young (8, 9th inning off Howry, 0 on, 2 out: 2 of 2). 10 Fick (11, 1st inning off Ritchie, 1 on, 2 out). 11 Lombard (1, 7th inning off Ritchie, 0 on, 1 out). 12 Magee (6, 9th inning off Howry, 0 on, 0 out). 13 Easley (4, 9th inning off Howry, 1 on, 2 out). 14 Lofton (4, 1st inning off Bernero, 0 on, 0 out). 15 Ordonez (15, 1st inning off Bernero, 0 on, 2 out: 1 of 2). 16 Ordonez (16, 8th inning off Paniagua, 3 on, 1 out: 2 of 2). 17 Valentin (11, 2nd inning off Bernero, 0 on, 0 out). 18 Alomar (6, 4th inning off Bernero, 0 on, 2 out: 1 of 2). 19 Alomar (7, 6th inning off Lima, 0 on, 1 out: 2 of 2). Baltimore vs Anaheim 20 Gibbons (14, 4th inning off Ortiz, 0 on, 2 out: 1 of 2). 21 Gibbons (15, 9th inning off Schoeneweis, 0 on, 0 out: 2 of 2). Oakland vs Minnesota 22 LeCroy (3, 1st inning off Zito, 1 on, 2 out). 23 Ellis (2, 8th inning off Jackson, 0 on, 1 out). 24 Saenz (4, 9th inning off Guardado, 1 on, 1 out). Kansas City vs Seattle 25 Ibanez (8, 2nd inning off Soriano, 0 on, 0 out: 1 of 2). 26 Ibanez (9, 9th inning off Sasaki, 0 on, 2 out: 2 of 2). 27 Tucker (4, 5th inning off Halama, 1 on, 0 out). 28 Sweeney (16, 9th inning off Sasaki, 0 on, 1 out). 29 Sierra (11, 2nd inning off Byrd, 0 on, 0 out). 30 Cameron (14, 6th inning off Byrd, 2 on, 2 out). National League Contributions Milwaukee vs Pittsburgh 31 Wilson, J (1, 1st inning off Quevedo, 1 on, 0 out). 32 Nunez (1, 7th inning off Quevedo, 0 on, 2 out). 33 Young (9, 8th inning off De Los Santos, 0 on, 1 out). 34 Hyzdu (1, 9th inning off DeJean, 1 on, 1 out). New York vs Philadelphia 35 Burrell (20, 3rd inning off Astacio, 0 on, 0 out). 36 Ledee (3, 6th inning off Astacio, 0 on, 1 out). 37 Rolen (12, 9th inning off Walker, 1 on, 1 out). Chicago vs Florida 38 McGriff (15, 4th inning off Penny, 0 on, 0 out). 39 Sosa (28, 5th inning off Penny, 1 on, 1 out). 40 Lowell (14, 3rd inning off Lieber, 0 on, 1 out). 41 Floyd (18, 5th inning off Lieber, 0 on, 1 out). Houston vs Cincinnati 42 Berkman (27, 1st inning off Hamilton, 1 on, 1 out: 1 of 2). 43 Berkman (28, 3rd inning off Hamilton, 2 on, 1 out: 2 of 2). 44 Dunn (16, 3rd inning off Miller, W, 0 on, 2 out). Montreal vs Atlanta 45 Barrett (8, 6th inning off Moss, 0 on, 0 out). 46 Tatis (11, 6th inning off Moss, 3 on, 2 out). San Diego vs St. Louis 47 Polanco (5, 2nd inning off Jarvis, 1 on, 2 out). 48 Edmonds (16, 2nd inning off Jarvis, 0 on, 2 out). 49 Pujols (18, 2nd inning off Jarvis, 0 on, 2 out). San Francisco vs Colorado 50 Shinjo (7, 1st inning off Neagle, 3 on, 2 out: 1 of 2). 51 Shinjo (8, 6th inning off Nichting, 0 on, 2 out: 2 of 2). 52 Bell (13, 1st inning off Neagle, 1 on, 2 out). 53 Minor (8, 2nd inning off Neagle, 1 on, 1 out: 1 of 2). 54 Minor (9, 4th inning off Stark, 1 on, 0 out: 2 of 2). 55 Sanders (10, 7th inning off Nichting, 1 on, 2 out: 1 of 2). 56 Sanders (11, 9th inning off White, 0 on, 0 out: 2 of 2). 57 Uribe (3, 2nd inning off Jensen, 0 on, 1 out). 58 Walker (19, 5th inning off Jensen, 0 on, 2 out). 59 Butler (4, 7th inning off Jensen, 1 on, 2 out). Los Angeles vs Arizona 60 Lo Duca (5, 1st inning off Helling, 0 on, 1 out). 61 Izturis (1, 8th inning off Swindell, 0 on, 1 out). 62 Karros (9, 9th inning off Swindell, 0 on, 2 out). http://www.baseball-fever.com/showthread.php?t=3643