Defending champion Mark Allen edged out Mark Williams 5-4 to progress to a semi-final meeting with Neil Robertson at the Northern Ireland Open.
Allen trailed 2-0 but breaks of 77 and 74 brought him level by the mid-session interval before he moved 4-2 up.
Williams fought back to 4-4 before Allen clinched a tense decider.
Earlier, Australian Robertson beat Mark Selby 5-2 while Scotland’s Anthony McGill and and China’s Zhou Yuelong progressed to the other semi-final.
McGill trailed another Chinese…
