 Complete the following phrase:  The 199900 season was a very successful one for Williams who won the 1999 UK Championship and the World Championship. These results, along with another ranking title and three runner-up positions, allowed him to capture the world number one position for the first time. In the World Championship final he came from 713 behind his fellow countryman Matthew Stevens to eventually win 1816. He also produced a notable comeback in his semi-final match against John Higgins, coming from 1014 down to win 1715. Williams won only one ranking event in the following season, the Grand Prix, with a 95 victory over Ronnie OSullivan in the final, but he was a runner-up in two other ranking events, the 2000 UK Championship and the China Open. This was enough to retain his number one ranking, although his title defence at the 