 Complete the following phrase:  In January, he played Mark Williams in the first round of the Masters, in a repeat of the previous years event, where Selby had won their first-round encounter 65. However, this time the finishing score line was reversed as Selby lost the deciding frame 56. He retained his China Open championship in April, defeating Barry Hawkins 113 in the final. This was Selbys third China Open title in four years. Later that month, his two-year reign as World Champion ended in the first round of the 