McDowell hits form but still has work to do to mount a challenge
Graeme McDowell raised his game at the RBC Heritage at Harbour Town Golf Links in Hilton Head but he remains eight shots adrift of joint leaders Luke Donald and Canadian Graham DeLaet.
Donald, who has finished second in the RBC Heritage four times, hit only 11 of 18 greens in regulation, yet made only a single bogey and holed a difficult pitch shot from right of the 18th green for a birdie that gave him a four-under par 67.
Ulsterman McDowell is on two under par after adding a 68 to his first round 72.
Shane Lowry is on one under par after a disappointing second round 75.
Meanwhile, France's Gregory Havret shot a second straight round of 70 and moved one stroke clear on six under par at the Trophee Hassan II's halfway point despite finishing with back-to-back bogeys.
Havret had shared the lead with three others after the opening 18 in Morocco and he was the only one of that quartet able to go that low again at Royal Golf Dar Es Salam.
Denmark's Lucas Bjerregaard, one of the joint leaders after the first round, and Trevor Fisher Jnr are one back while Irishman Paul Dunne is only two off the lead.
Belfast's Michael Hoey shot a 73 to add to his first round 76, leaving him on three over par but he missed the cut.