Published Monday, 10 March 2014
McIlroy scored a single birdie on his final round and three bogies. (© Getty)
Despite an encouraging opening in Doral, a poor third and fourth round from both local golfers saw them drop further down the leader board.
McDowell finished the final round on one over par, two over for the tournament and tied ninth overall.
While McIlroy returned a 74, to end on plus five and in a tie for 25th place.
The Co Down golfer had begun the weekend one shot off the lead, but the former world number one suffered a dismal final two rounds to finish five shots off the pace.
McIlroy told tournament website, worldgolfchampionship.com he felt his putting let him down.
He said: "I feel like I struck the ball well for the most part.
"On the greens I didn't get anything going with the putter and anytime I missed the green I didn't really get anything going."
He added: "It's a frustrating golf course because you feel like you should be doing so much better and it just doesn't allow you to.
"You have to be just so precise to get the ball close to the greens for those pin positions."
American Patrick Reed won the competition, holding his nerve in the final holes to record a one-shot victory over fellow American Bubba Watson and Welshman Jamie Donaldson.
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