Rory McIlroy sits eight shots off the pace at the RBC Canadian Open, while Shane Lowry will see weekend action after sneaking inside the cut.
McIlroy couldn't match his opening round 66 exploits, carding three bogeys and a single birdie on his way to a 72.
He sits on two-under par, eight shots adrift of joint-leaders Bob McIntyre and Ryan Fox.
Lowry picked up three birdies on after the turn – the Offaly native started at the 10th – to shoot a 68 and finish among a cluster of players on level par and just inside the cut.
Seamus Power’s weekend however is over after a 71 saw him finish on three-over par.
Scotland's MacIntyre credited having his dad Dougie as caddie for his impressive form to enjoy the mid-way lead.
The Ryder Cup winner, so far bogey-free, followed up Thursday’s 64 with a 66 to post a 10-under total to share the lead with New Zealander Fox two shots clear at the Hamilton Golf and Country Club.
That was three better than overnight leader David Skinns after the Englishman could manage only a one-over 71, nine strokes worse than his opening round.
MacIntyre is currently without a regular caddie and his father flew out on Sunday to carry for him this week.
The Scot said after the events of last week, when news emerged PGA Tour pro Grayson Murray had taken his own life hours after walking off the course, meant he was determined to enjoy the rare opportunity with his dad.
"We were walking up the last and he said, 'I think I might need to start negotiating a wage this week," said MacIntyre in his post-round interview.
"It’s an experience for both of us. He’s done a good job so far.
"It’s good for the two of us, it’s taken my mind completely off the game of golf.
"After the news of last week things are a lot bigger than the game of golf. We are human beings and I’ve put my dad on the bag and we are just trying to enjoy it as much as we can because we don’t know how much longer we have got of that.
"There has been zero expectation as there’s been a lot going on this week. I came out here, put my dad on the bag and tried to play smart golf, missing on the right side and I have done that so far.
"I’ve had a shot wherever I’ve missed it and had a chance to get up and down. I’m playing solidly enough and happy with the first two days."
"I’m just trying to get into position for the weekend."
The left-hander holed a 12-foot birdie putt at the first and added another after reaching the par-five fourth in two.
His sharp approach play on the back nine brought two further birdies after hitting it to seven feet on the short par-four 12 and then even closer on the 422-yard 15th.
MacIntyre could not take advantage of the par-five 17th after having to splash out of a fairway bunker but he got up and down for a par at the last. Fox had seven birdies in a round of 64.
