 Complete the following phrase:  In 2007, OSullivan won his third Masters title and his fourth UK Championship, his first ranking title in almost three years. He won his third world title in 2008, defeating Ali Carter 188 in the final, after which he held the world number one ranking for the next two seasons. He added his fourth Masters title in 2009. After two seasons that saw him fall out of the top ten in the world rankings for the first time, he began working with psychiatrist Steve Peters in 2011. A resurgent OSullivan captured his fourth World Championship in 2012, again defeating Carter in the final, after which he paid tribute to Peterss work with him. The following season, he took an extended break from the professional tour. Despite playing only one competitive match all season, he returned to the Crucible for the 2013 World Snooker Championship and successfully defended his world title, defeating Barry Hawkins 1812 in the final. In his 2014 Masters quarter-final against Ricky Walden, he set a new record for the most points without reply in professional competition, with 556, and went on to beat the defending champion Mark Selby 104 in the final to claim his fifth Masters title. At the 