Adam Scott stays in control at Bay Hill

Masters champions in total command as Graeme McDowell and Darren Clarke struggle

The leader Adam Scott of Australia hits his tee shot on the 12th hole during the second round of the Arnold Palmer Invitational at the Bay Hill Club and Lodge in Orlando, Florida. Photograph: Sam Greenwood/Getty Images

Adam Scott left the field trailing in his wake as he closed in on a victory in the Arnold Palmer Invitational which could see him defend his US Masters title as world number one.

Scott holds a three-shot lead after a stunning opening 10-under-par 62 at Bay Hill, which equalled the course record held by Andy Bean and his fellow Australian Greg Norman. And the 33-year-old extended his advantage to seven strokes with a second round of 68, marred only by bogeys on the seventh and 18th, where he three-putted from long range.

Victory on Sunday would leave Scott fractionally behind the absent Tiger Woods in the world rankings, but if neither man played again before Augusta, Scott would assume top spot in the rankings in time for the first major of the year.

The world number two got off to a slow start on Friday with five straight pars and although he two-putted the par-five sixth for his first birdie of the day, he promptly gave that shot back on the next after failing to get up and down from a greenside bunker. Another bogey looked possible on the ninth after his drive into the rough left him with an awkward angle to the green, but a superb approach to 10 feet actually set up another birdie.

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Scott’s birdie attempt on the 10th caught the edge of the hole and span out, but that proved to only be a temporary blip as he holed from four feet on the 11th and five feet on the 12th. Further birdies on the 16th and 17th took Scott eight clear of the field and a superb drive down the last left him just 150 yards from the pin, but he paid the price for a conservative approach, three putts from 50ft for a bogey dropping him back to 14 under par.

Italy's Francesco Molinari and American duo JB Holmes and Chesson Hadley were Scott's closest challengers on seven under par, with Welshman Jamie Donaldson carding a 71 to lie six under alongside former US PGA champion Keegan Bradley and Brandt Snedeker.

Ian Poulter also returned a 71 to lie five under, but it was not such a good day for his Ryder Cup team-mate and fellow Orlando resident Graeme McDowell, who followed his opening 68 with a second round of 77 that did not feature a single birdie. After starting from the 10th, McDowell dropped shots at the 13th and 18th to be out in 38 and then finished in nightmare fashion with a double-bogey on the eighth and bogey on the ninth.

McDowell at least made the cut on one over par, while US Open champion Justin Rose made an early exit after crashing to a second round of 79. Rose carded six bogeys, two double bogeys and three birdies to finish three over par, 17 shots behind playing partner Scott.

Pádraig Harrington had a second successive 70, which included an eagle on the par five 16th, while Darren Clarke shot a disappointing 78 including a double bogey at the last to lie nine over and to miss the cut.