 At that season's World Championship, he lost 1–10 to Judd Trump.By the end of the 2009/2010 season, Delaney's form had slipped, although he recorded a 10–0 whitewash over Sam Baird in qualifying for the 2010 World Championship; in his next match, he recovered from 0–8 down against Adrian Gunnell to trail only 7–9, leading the seventeenth frame by fifty-six points before Gunnell made a break of 64 to prevail 10–7.With the introduction of Players Tour Championship events in 2010, Delaney played in fourteen tournaments that season, notably beating Patrick Einsle, Rory McLeod, Greene and Li Yan before exiting at the last-32 stage at the 2010 Shanghai Masters, 3–5 to Mark King.