Alonzo Albert Mattern (June 16, 1883 – November 6, 1958) was a professional baseball player who pitched in the Major Leagues from 1908 to 1912. He played for the Boston Braves.
Al Mattern
| Given name: | Alonzo Albert Mattern |
| Nicknames: | None |
| Primary Pos: | Pitcher |
| Hght/Wght: | 5'10" / 165 lbs |
| Bats/Throws: | L / L |
| Born: | Jun 16, 1883 in West Rush, NY |
| Died: | Nov 6, 1958 in West Rush, NY (75 years old) |
| Debut: | Sep 16, 1908 |