(CNN) -- A stunning 10-under par round of 62 fired Bubba Watson to the top of the leaderboard at the halfway mark of the WGC-Cadillac Championships on Friday.
The left-hander followed up his opening round of 70 with a string of birdies -- nine in all -- and an eagle with the only bogey coming six holes from home.
The American leads by one from his playing partner Justin Rose who had a similarly happy time of it on the TPC Blue Monster course in Florida.
The Englishman finished with flawless eight-under par round of 64.
Joint first-round leader Adam Scott finished the day strongly (four birdies on the closing six holes) to claim third place on 10-under.
Jason Dufner who topped the leaderboard with the Australian after day one could only manage a even par 72 to slip down into a tie for tenth.
Denmark's Thomas Bjorn completed another faultless four-under par 68 to leave him in a tie for fourth with Keegan Bradley who posted a round of 67.
The American bagged five birdies on the opening nine but came back in level par.
Germany's Martin Kaymer shot a eight-under par 64 to move up into a tie for seventh with South Africa's Charl Schwartzel (69) and America's Charles Howell III (67).
Tiger Woods followed up his opening par 72 round with a five-under par 67 to tie for 16th, while new world No.1 Rory McIlroy also improved on his opening round (73) finishing strongly to post a three-under par 69.
The Northern Irishman is still well down the field currently tied for 28th and ten shots behind Watson.
Luke Donald, who can return to the top of the world rankings if he wins this weekend, is well placed to make a move on Saturday.
The Englishman is currently tied for 10th on six-under par after posting a polished second round 68.