Graeme McDowell is two shots behind Tiger Woods at the half-way stage of the WGC Cadillac Championship.

Woods continued his return to form after a spectacular 7 under par 65 at the Blue Monster course in Doral to hold a two shot lead from 13-under par.

McDowell is closest to him on 11 under par after picking up five shots for his second round.

It was also a better day for Rory McIlroy, who carded a 3 under par 69, which leaves him 2 under par.

But Padraig Harrington's struggles continued after he could only manage a level par 72 that leaves him on 4 over.