Peter Lawrie and Alvaro Quiros are one shot further back while eight players share 6th position another shot back and six from the lead, that group including Justin Rose.
Morrison, whose only European Tour victory to date came at the Madeira Islands Open in early 2010, is delighted to have his putter back as he described the reason for his effort to lead such an elite field.
"Yeah, I've been playing fantastic for two months now," said Morrison. "My coach and I have been working really hard and my game has turned full circle, short off the tee, a bit crooked, but great short game. But now 15 yards longer than I ever have been, maybe 20, and it's helping around this golf course. It's a pretty long golf course. The last few months, putter has been cold but playing great. Matter of time, really, and it's happened to be this week which I'm very grateful for.
For the second successive day Morrison eagled the final hole today adding to the six birdies he had compiled in what he desrcibed as easy fashion.
"I'm very happy with how I played today. Definitely one of the best rounds I've ever had, yeah, for sure, and probably one of the easiest funny enough, or it felt easy. Wish golf was like that every day but it's not."
Morrison played Pennant Golf in Melbourne during his amateur career when he represented the Waverley Gof Club there and turned professional in 2006.
Donald, who will regain the world number one position with a finish inside the top eight this week given Rory McIlory's early exit from the event, was also delighted with his putting.
"I'm feeling very strong on the greens. I feel like something that has been not as consistent for me over the last couple of months, but felt very comfortable on the greens the last two days. Every time I've had opportunities, I'm seeing the line, and got the speed down and making some good putts."
World number one McIlroy missed the cut by a massive eight shots after a second round of 79. "I think I might have taken my eye off the ball a little bit, so I just need to go back and work hard and try to get it back to the level that it was leading into the Masters, said McIlroy."
"I just feel like I've lacked competitive rounds maybe a little bit. I take a couple of weeks off after the Masters, played Quail Hollow great, and then we had two days at PLAYERS championship and another week off from competitive golf and another two days here. I'm looking forward to hopefully getting over to the States and playing four rounds next week."
World number three Lee Westwood just made it through to the weekend with a birdie at the last after dropping four shots over the previous three holes.
The leading Australian is Andrew Dodt in 30th position at 2 under followed by Bett Rumford at even par.