qualifier mcgill exuded calm assurance as he saw off defending champion 13-9 to book a quarter-final place , never appearing overawed by the match .
this is mcgill 's first world championship and it had already been one to remember before he crossed cues with selby , having beaten his fellow glaswegian and sometime practice partner stephen maguire 10-9 in the opening round , finishing with a century .
anthony mcgill celebrates beating mark selby during day seven of the betfred world championships .