Robertson started the new season by losing in the first round of the 2010 Shanghai Masters to Peter Ebdon. However, at the World Open Robertson was drawn in the last 64 against Graeme Dott in a repeat of their world final, Robertson won 3–1 and went on to beat David Morris, Andrew Higginson, Ricky Walden and Mark Williams before producing an assured display to beat Ronnie O'Sullivan 5–1 in the final, to confirm his position as the eighth world number one in snooker. Robertson was invited to the Premier League Snooker, where he reached the semi-final. He lost 1–5 against O'Sullivan. Robertson reached the quarter-final of the UK Championship, where he lost 7–9 against Shaun Murphy.