By the end of September, there had been only four draws in the Premier League. Most customers bet on wins so bookmakers have faced more payouts.
William Hill saw revenue fall 3% in the three months to 29 September, but added that its full-year expectations for its retail arm were broadly unchanged.
Earlier this month,
rival Ladbrokes also revealed a 15% fall in revenue.
William Hill said its online business was particularly affected by the "unfavourable sporting results".
Manchester United and Chelsea, two of the most heavily backed clubs, each won six out of seven games up to the end of September.
Tony