Mathias John Zeiser (sometimes spelled Zieser) (September 25, 1888 â June 10, 1942) was an American professional baseball pitcher. He appeared in two games in Major League Baseball for the Boston Red Sox during the 1914 season, both as a relief pitcher. Zeiser batted and threw right-handed. He was born and died in Chicago, Illinois.
In a two-game career, Zeiser posted a 1.80 earned run average with eight walks in 10 innings pitched.