George "Rube" Foster made his MLB debut pitching for the Red Sox on April 10, 1913. The RHP pitched in a total of 19 games that season, going 3-3, 3.16 with 8 games started. His 1914 season was arguably his best, as Foster went 14-8, 1.70, pitching to a 1.020 WHIP. A year later, Foster won a career high 19 games and two more in the World Series for the Red Sox against the National League Champion Philadelphia Phillies. In 1916, Foster spent some time in the Red Sox bullpen as the Red Sox had maybe one of the best overall pitching staffs in the history of MLB. The starting rotation consisted of Babe Ruth, Dutch Leonard, Carl Mays and Ernie Shore. Foster was the 5th starter and also worked in relief, joining "Sad" Sam Jones and Herb Pennock. They had "Smokey" Joe Wood in 1915, which made the staff even more star studded. The Red Sox, of course, won the 1916 World Series over the Brooklyn Robins, winning also in 5 games.
After the 1916 season, Foster developed some arm trouble after 17 games, 16 starts where he went 8-7. He would not pitch again professionally until the 1923 season when he pitched for Vernon of the Pacific Coast League. His last two professional seasons saw Foster lose a total of 33 games for the Oakland Oaks of the PCL. He would retire from baseball after the 1925 season at age 37, long before passing away on March 1, 1976 at age 88.