In March, Allen won his first ever ranking event as he captured the World Open title in Haikou, China. He beat qualifier Jimmy Robertson in the first round, before exacting revenge over Judd Trump for his defeat in York, by coming back from 0–3 down to triumph 5–4. He comfortably beat Mark King 5–1 in the quarter-finals, before producing another comeback from 2–5 down against world number 1 Mark Selby to win 6–5 and reach his second ranking final of the season. Allen played Stephen Lee in the final and dominated the encounter from start to finish as he won by 10 frames to 1. His season finished in disappointment, however, as he exited both the China Open and World Championship in the first round, to end the year where he started it, ranked world number 12.