 Complete the following phrase:  Hamilton turned professional in 1991, entering the worlds top 32 in a hrefSnooker20world20rankings201995199619951996a. Hamilton has reached two ranking tournament finals. In the British Open in 1999, where he lost to Fergal OBrien, Hamilton opened with two centuries, but OBrien won five frames on the final black to defeat the Nottingham man. The other was the 2001 China Open. Mark Williams beat him 98, despite Hamilton having led 85. He made the first of his four World Championship quarter-finals in 