Anthony McGill moved to within four frames of a second successive semi-final appearance at the World Snooker Championship by hitting back to gain the upper hand on Stuart Bingham on Tuesday. McGill, conqueror of defending champion Ronnie O'Sullivan in round two, registered two century breaks in a high-scoring second session en route to establishing a 9-7 overnight lead over the 2015 winner. Neil Robertson's quarter-final clash with Kyren Wilson is tantalisingly poised at 8-8 following two sessions of captivating snooker. Australian Robertson carried a 5-3 lead into the evening and the momentum continually shifted during an engrossing display of impressive pots, inventive safety and unexpected misses.