The 29-year old Willett has enjoyed just two top-10s since being fitted last April with the famed Augusta National members green jacket.
Willett’s frustration boiled over last Sunday after finishing in a distant share of 68th place in the Turkish Airlines Open at Belek in Turkey.
Two days earlier he tweeted after a second round 74: "Well this game is really kicking me in the nuts at the minute!! If it’s not thing it’s another. Haha."
Willett had journeyed to Turkey lying second on the Race to Dubai and needing to finish fifth or higher to move back to No. 1 in the rankings, and a place he has enjoyed since his Major Championship triumph.
And Willett was so annoyed in posting a last round 75 in Turkey his immediate reaction was to withdraw from this week’s Nedbank Challenge at Sun City in South Africa and the second of the three European Tour Final Series events.
"It couldn’t happen at a worst time," he said in reference to his poor run of form.
"Things are not just going our way, nothing feels great."
Since finishing second in September’s Italian Open Willett missed the cut in the Alfred Dunhill Links Championship, that included a third round 76, while he lost the No. 1 ranking to Henrik Stenson in slumping to 75th place in the following weeks WGC – HSBC Champions event.
Willett’s scores over the four days in Shanghai were 74, 78 and a pair of 75s and a far cry from the super final round 67 he shot to win theMasters.
His poor showing in Turkey has now seen Willett drop a further place on the World Rankings to be now ranked No. 11.
This is the first time he’s been outside the top-10 since moving from 12th to ninth in winning the Masters.
