On the first day of the 2010 World Championship on 17 April 2010, Allen came close to recording his first ever maximum break in his first round match against Tom Ford after potting 15 reds with blacks, and the yellow, before breaking down on the green. Five days later, Allen made the first 146 break in World Championship history, and the second of his career after defeating Mark Davis 13–5 in the second round. He was defeated 12–13 in the quarter-final by Graeme Dott, having led 12–10.