At the 2009 World Championship, he reached the semifinal for the fifth successive year, where he was narrowly defeated by eventual champion Ted Hankey. Later that year, he won his second successive Masters title, once again by a 7–6 scoreline in the final, over Robbie Green after Green led by 6–3 and had a dart for the title. This win made Adams the first man to retain the Masters title since Bob Anderson in 1988. Adams joined Eric Bristow, Richie Burnett, Bob Anderson and John Walton as the fifth player to win them in the same season.