Born in Reading, Pennsylvania, Wagner signed with the Red Sox in 1935 and made his MLB pitching debut on April 19, 1938. After being used in both starting and relief duties, he enjoyed his first full season as a starter in 1941. He was the second in a pitching rotation that included Dick Newsome, Mickey Harris and Lefty Grove. Wagner finished with a 12–8 record and three shutouts, and his 3.07 earned run average was the best on the Boston pitching staff and the third best in the American League, being surpassed only by Thornton Lee (2.37) and Al Benton (2.97), and over Marius Russo (3.09).\n', '

In 1942, Wagner compiled career-highs in victories (14, eight in AL), starts (26), complete games (17, seventh in AL), strikeouts (52), innings pitched (205​1⁄3), and had a 3.29 ERA. After the season, he left his team to serve in the Navy during World War II. Wagner returned to the Red Sox in 1946, along with teammates Ted Williams, Dom DiMaggio, Bobby Doerr, Johnny Pesky, Tex Hughson and Joe Dobson. He pitched his final game on August 8, 1946, ending with a 1–0 mark in 30​2⁄3 innings.\n', '

In a six-season career, Wagner posted a 32–23 record with 157 strikeouts and a 3.91 earned run average in 527​2⁄3 innings pitched.\n', '

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