(Reuters) - Jason Day, who has worked hard to hone a "killer instinct", drained a 35-foot birdie putt on his final hole to storm five shots clear midway through Friday's second round of the Arnold Palmer Invitational in Orlando, Florida.
One stroke ahead overnight, the Australian world number three was again superb on the greens at Bay Hill needing just 27 putts on the way to a seven-under-par 65 and a 13-under aggregate of 131.
American Jamie Lovemark was alone in second after carding a 68, with England's Paul Casey a further stroke adrift at seven under after a 69.