 Complete the following phrase:  In addition to his six world titles, Davis won the UK Championship six times and the Masters three times for a total of 15 Triple Crown titles, placing him third on the all-time list behind Ronnie OSullivan 20 and Stephen Hendry 18. During the 198788 season, he became the first player to win all three Triple Crown events in a single season, a feat that only Hendry and Mark Williams have since emulated. His career total of 28 ranking titles places him fourth on the all-time list behind OSullivan 37, Hendry 36, and John Higgins 31. He won his last major title at the 1997 Masters, but continued to compete at a high level into his 50s, making the last of his record 30 Crucible appearances in 2010, when he defeated the defending world champion John Higgins to become the oldest world quarter-finalist since 