In 1926 Ferguson set a major league record for the highest ERA during a regular season by a pitcher who started a postseason game the same year. Ferguson collected a combined 6.18 ERA while pitching with the Red Sox, Yankees and Senators. The mark was broken in 2006 by Óliver Pérez of the New York Mets, who posted a 6.55 ERA during the regular season before starting Game 4 of the NL Championship Series.