On a day when Race to Dubai leader Tommy Fleetwood revived his hopes of claiming the money title with a second-round 65, Dunne was frustrated on the greens all day before a closing eagle left him just three shots behind leader and defending champion Matt Fitzpatrick on seven-under par at halfway.
"At least with that score I have kept myself in with a chance of the tournament". Rose is looking for his third straight win, and Fleetwood is trying to cap a career year.
Fitzpatrick carded a second consecutive 67 at Jumeirah Golf Estates to reach 10 under par, a shot ahead of the man he beat into second place a year ago, English compatriot Tyrrell Hatton.
A grandstand finish to the season to rival any in European Tour history seems assured on Sunday as Justin Rose and Tommy Fleetwood slug it out over one more round for the prize title of the Race to Dubai.
Indeed, Rose was 256,000 points behind coming into this week, but, although the permutations were and still are devilishly complex, Rose made it an easy challenge for himself, even brushing away the notion that he should Fleetwood fail to triumph then solo second will do him. "Yesterday I was clearly nervous".
With a one shot lead and in the middle of the 18th fairway, Justin Rose does this. It was one of those days where I felt quite exhausted.
"He's doing everything he has to and I'm doing the same, it's perfectly set up".
Sergio Garcia, third in the Race to Dubai, is five under for the tournament.
Hatton was on target to equal or better Rose's course record of 62 after holing from 144 yards for an eagle on the fifth and making eight birdies, only to bogey the last.
They are separated by two shots only and as Rose has to win the event to secure the Race To Dubai, better get your popcorn and beer ready and strap yourselves in for a roller coasters finale!
But the same can be said for Tommy Fleetwood. This is going to be a day just to go for it really and play well.
The European Tour has been afforded the season-ending climax marketeers dream of. Justin Rose's bogey at the last, when he took four to get down from the edge of the green, was an unfamiliar unforced error.
A strong finish to the season, though, carried over into 2017, Fleetwood winning twice and finishing as a runner-up on two other occasions, together with six more placings in the top 10.
Meanwhile, Matthew Fitzpatrick continues his love affair with this course - he looks so at home on these putting surfaces.
This time, Rose has the lead, but he says things aren't all that different.