• WGC-CA Championship

Els on song at Doral

Robert Allenby's hole in one on the 13th took him to seven-under © Getty Images

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• Profile: Paul Casey | Luke Donald | Ernie Els | Padraig Harrington | Rory McIlroy | Phil Mickelson | Ian Poulter | Lee Westwood

Ernie Els hit a flawless round of six-under 66 to move to the top of the leaderboard at the WGC-CA Championship at Doral.

The South African, who won the championship back in 2004, scored six birdies on the notorious Blue Monster course to move to ten-under after round two.

Els is one shot clear of Australian Robert Allenby, who, in sharp contrast to Els' bogeyless round, endured a rollercoaster day, scoring three bogeys, a double bogey, six birdies and two eagles to go five-under for the day.

Allenby, whose last win on the PGA Tour came back in 2001, hit a stunning hole-in-one on the 13th hole, to take him to seven-under, but a double bogey three holes later undid his good work.

"It landed perfect, about 15 feet short of the hole and then sort of checked up and then rolled up into the hole," Allenby said of his hole-in-one.

Overnight leader Charl Schwartzel remains in contention, three shots off the pace after carding a two-under round of 70. He shares third place with America's Bill Haas, who continued to enjoy his championship debut with a bogeyless 66 round to move to seven-under par.

Padraig Harringtonand Soren Hansen are the best of the Europeans on six-under, four shots off the lead. Harrington scored five birdies to card a round of four-under 68.

"When you spend your winter working on things, it does take a while to get everything back together again," he said. "So that's my nature. I'll be happy, if I hit peak form from the Masters through to The Ryder Cup, you're going to have a successful year."

Vijay Singh leads the chasing pack of six on five-under, while defending champion Phil Mickelson moved up to four-under.

Paul Casey is the top Brit, after his a par round saw him stay on three-under, while Luke Donald double-bogeyed the 18th to card a three-over 75 to drop to one-over for the championship.

After his four-over opening round, Northern Ireland's Rory McIlroy is the wrong end of the leaderboard after his second-round score of 73 sees him five-over.

It was not a good day at the office for Ian Poulter, the WGC Match Play champion hitting seven bogeys in a six-over round. Oliver Wilson endured mixed fortunes, struggling to settle on the notoriously difficult Blue Monster course. Wilson parred just two holes on the back nine to move to eight-over for the tournament.

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