In January 1971, Hiller suffered a heart attack and underwent intestinal surgery to control his body's absorption of cholesterol. After missing the 1971 season, Hiller returned in 1972, helping the Tigers win the American League (AL) East title and winning Game 4 of the 1972 AL Championship Series. In 1973, he compiled a 1.44 earned run average (ERA) and broke the major league single-season saves record with 38. "The Sporting News" awarded Hiller its 1973 Comeback Player of the Year and Fireman of the Year awards.