(CNN)Rory McIlroy’s hopes of regaining golf’s No. 1 ranking have been hit by an injury setback — and he’s not happy about it.
The four-time major winner has been ruled out of this week’s Abu Dhabi Championship after scans revealed he has a stress fracture in one of his ribs.
McIlroy had played with a suspected back injury at the South African Open, where he was beaten in a playoff by world No. 251 Graeme Storm of England on Sunday.
“It’s bitterly disappointing to have to withdraw from the Abu Dhabi HSBC Championship,” McIlroy said in a statement Monday.
Thomas followed up his Tournament of Champions victory by winning the Sony Open — also in Hawaii — by seven shots from Justin Rose.
The 23-year-old started by becoming the youngest player to shoot 59 on Thursday, then added a 36-hole scoring record and finished by setting the best for 72 holes.
His 27-under-par total of 253 was seven strokes clear of Olympic champion Justin Rose, with world No. 5 Jordan Spieth third on 19 under.