A number of batting greats have taken a turn or two on the mound. Stan Musial, who pitched regularly (and well) in the minors for three years, threw an incomplete inning for the Cards in 1952. Ted Williams yielded three hits and one run in two innings in 1940. Jimmie Foxx (534 career home runs) pitched a perfect inning for the Red Sox in 1939 and then, winding up his career with the Phillies, threw 23 innings in 9 games in 1945, for a earned run average of 1.52 for his career.
Going further back, Ty Cobb gave up six hits and two walks in four innings in 1918 and pitched a perfect inning seven years later. Truly impressive was the St. Louis Browns’ George Sisler, a kind of Ruthian double-threat man who twice hit over .400 and yet managed to pitch 111 innings in 24 games between 1915 and 1928, posting an e.r.a. of 2.35 for his career.