sentences:  He and John Clarkson (53 wins in 1885) are the only pitchers to exceed 50 wins in a single season in the current major leagues; Guy Hecker also accomplished the feat in the American Association.The American League leader is Jack Chesbro, who won 41 games for the New York Yankees in 1904; his total is the highest since Major League Baseball's consolidation in 1901.The highest total in the National League since 1901 is Mathewson's 37 victories in 1908.