Darren Clarke finished 18th after closing with a round of 73.

Campbell claimed a maiden tour title in fine style at Champions Golf Club, carding a closing 68 for a 16-under-par total of 268.

The 29-year-old, who was born and still lives in Texas, took the first prize of 1.08million US dollars (€1.6m) after three second-place finishes earlier in the season, including the USPGA Championship.

Charles Howell birdied the last to claim second place outright on 13 under, one ahead of Retief Goosen, the former European number one having birdied three of the last four holes.

“This is what I was working for this whole year,” Campbell said. “I am just happy to get my first win.”

Singh, whose share of fifth made it 11 top 10s in his last 12 events, said: “I am really proud of what I have accomplished this year. Especially at my age, it is a great accomplishment.

“I still have to improve on a lot of things, you never stop working. After the Presidents Cup I will look back and see what I need to work on.”

The only thing missing from Singh’s CV this year was a third major title, and he added on Sky Sports 2: “I would like to win a major next year if I can.

“I had good opportunities to do well this year but never really pulled it off.”

Tiger Woods, who needed to win to overhaul Singh and claim an unprecedented fifth straight money title, stumbled to a final round 74 and one over par total of 285, finishing 26th of the 31-strong field.