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Robertson started the morning session in style by grabbing a century with opening breaks of 140, 123 and 87, but Liang would keep fighting back with scrappy frames.
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And despite Liang's significantly lower pot success percentage, the world number 34 stuck with it and registered his first century in the last frame - frame nine - a break of 113, to ensure the two were separated by just a frame heading into the evening session.
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Bingtao dominating debutant Slessor
Yan Bingtao takes a considerable 7-1 lead heading into tomorrow's afternoon session against Englishman Elliot Slessor.
The 20-year-old from China registered four frames on the bounce, including a 66 in the opening frame and a 119 century in frame four, before Slessor clawed back a frame with a break of 60.
But Slessor was simply unable to cope with Yan who finished on 76-35 in the eighth frame to all but secure his place in the second round.
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