Second-round leaderboard (par 72)-10: T Woods (US), C Wi (Kor) -9: G McDowell (NI), J Dufner (US)-6: J Rose (Eng)-5: B Watson (US), S Garcia (Spa),   -4: I Poulter (Eng), J Wagner (US)FLORIDA - Tiger Woods produced a flawless round of 65 to take a share of the halfway lead at the Arnold Palmer Invitational. Woods, aiming for a seventh Bay Hill title, hit seven birdies to take him to 10 under par, tying Korea’s Charlie Wi.They lead America’s Jason Dufner and Northern Ireland’s Graeme McDowell by one shot after two rounds in Florida.McDowell, the 2010 US Open champion, had earlier recorded a superb nine-under round of 63, including seven birdies and an eagle. England’s Justin Rose hit a solid 69 to reach the halfway point in fifth place at six under.Woods said: "I putted well. I didn’t feel I hit it all that great, but the good thing is my misses are better and I played smart.”On the Achilles he strained at Doral a fortnight ago, he added: "I’ve been getting treatment and everything is moving properly. No swelling, so everything is good.”Woods was in imperious form throughout as he chased his first US PGA Tour victory for more than two-and-a-half years.The 36-year-old was six shots behind when he teed off, but four successive birdies from the fourth saw him make the turn in 32.