 Complete the following phrase:  OSullivan began the 199899 season by winning the non-ranking Scottish Masters, but went on to win no more titles during the season. At the UK Championship, OSullivan was defending champion, but withdrew from the tournament shortly before his scheduled first-round match. His manager stated that he was suffering from physical and nervous exhaustion and that his doctor had ordered a complete rest from snooker. Later reports stated instead that he was suffering from depression at the time. In the quarter-finals of the Welsh Open, OSullivan made the second maximum of his professional career, playing against James Wattana. OSullivan reached the quarter-finals of the Masters, but lost 26 to Ken Doherty. In his fourth consecutive final in the Charity Challenge, and in a repeat outcome of last years final: OSullivan lost to John Higgins again, this time 49. At the 