Alvaro Quiros will take a one-shot lead into the final round of the Hong Kong Open with Rory McIlroy three behind the Spaniard following a difficult day for the US Open champion.
Quiros began the day level with McIlroy at the top of the leaderboard and picked up three birdies in a 67 to finish 10 under, one ahead of Sweden's Peter Hanson.
YE Yang and Pariya Junhasavasdikul are tied for third on eight under but Scotland's Richie Ramsay slipped back to four under after a disappointing 72.
McIlroy started in solid fashion but, after missing a birdie chance on the third, found sand at the par-three fourth and his par putt from around 10 feet grazed the edge of the hole.
Worse was to follow as his drive at the fifth ended behind a tree and, after chipping onto the fairway, his third shot missed the green.
However, he managed to get up and down to limit the damage to a bogey and drop to five under par.
McIlroy then steadied the ship with a string of pars before collecting his first birdie of the day at the 13th.
He also drained a mid-range putt for another at the 17th as he battled back to post a 70 and remain in the hunt.
Ryder Cup team-mate Peter Hanson moved into second place after a fine 65 which included one bogey and six birdies.
England's David Horsey is in the group at five under par following a 69, while defending champion Ian Poulter is six shots off the lead after a 67.