In his rookie year, Alexander led the league with 28 wins (a modern-day rookie record), 31 complete games, 367 innings pitched, and seven shutouts, while finishing second in strikeouts and fourth in ERA. From 1912 to 1921, Alexander led the league in ERA five times (1915-17, 1919, and 1920), wins five times (1914-17, 1920), innings six times (1912, 1914-17, 1920), strikeouts six times (1912, 1914-1917, 1920), complete games five times (1914-1917, 1920), and shutouts five times (1915, 1916 [a single-season record 16], 1917, 1919, 1921).  He won pitchings Major League Baseball Triple Crown in 1915, 1916, and 1920, and is sometimes credited with a fourth in 1917. In 1915, he was instrumental in leading the Phillies to their first pennant, and he pitched a record five one-hitters.  Along the way Alexander began to have problems with alcohol, a struggle that would plague him the rest of his life.. How many years did Alexander lead the league in ERA five times?