He lost in the quarter-finals of the China Open 3–5 to Peter Ebdon, before drawing 1997 champion Ken Doherty in the first round of the World Championship. Robertson won the match 10–4 and then beat qualifier David Gilbert 13–9 to set up a quarter-final clash with Ronnie O'Sullivan. Robertson was 5–3 ahead after the first session, but his opponent produced a match defining run of six frames in a row and went on to win 13–10. Robertson finished the season ranked world number seven.