Summers went 24-12 as a rookie with the pennant-winning Tigers in 1908. That September 25, he hurled two complete-game victories over the A’s. He had 19 wins in 1909, but his best-pitched game was not one of them; on July 16, he hurled 18 innings to a scoreless tie against Washington, allowing seven hits and one walk. He lost all four of his World Series assignments in 1908-09. He was a notoriously poor hitter, and both of his ML home runs came in a September 17, 1910 game against the Athletics. Rheumatism hampered his pitching, and he faded to the minors in 1912.