Maguire produced his best snooker to beat Joe Perry 6–4 and Robertson 6–2 at the Masters. He faced O'Sullivan in the semi-finals and saw his errors punished by the reigning world champion to lose 6–2. Maguire won three matches to reach the last 16 of the Welsh Open, but relinquished his title by losing 4–3 to 19-year-old Joel Walker. He then lost in the first round of the next two ranking events and withdrew from the China Open to enter the World Championship in poor form. Maguire produced a comeback from 6–3 and 9–6 down against Ryan Day to send the match into a deciding frame but, despite having a chance to win, he lost 10–9. Afterwards, Maguire described his season as one from hell and said he was glad it was over. He ended it as the world number 14.