It took only a minute or two on a bitterly cold morning at Wentworth for Rory McIlroy and Graeme McDowell to banish any talk of a chill in their friendship.
After their opening shots landed side-by-side in the heart of the first fairway, McIlroy and McDowell looked more like the Chuckle Brothers than the Fighting Irish as they marched in perfect step to their golf balls.
Four and a half hours later, however, those smiles were replaced by matching grimaces as the pair – as well as fellow Ulsterman Darren Clarke – signed for frustrating first round 74's in the BMW PGA Championship.
If McIlroy's regard for McDowell appears as strong as ever, his relationship with his new Nike Method putter is less cosy.
For the second time since signing that lucrative $20m per annum deal with Nike last winter, the Holywood native went back to his old Scotty Cameron yesterday.
McIlroy dumped the Method after just 18 holes at the Abu Dhabi Championship, his seasonal debut and first event as a Nike player, explaining he needed a putter with more weight in its head to get the ball to the hole on heavily-grained greens.
He missed the cut in Abu Dhabi and reverting to a Scotty Cameron putter hardly produced the desired result once again yesterday as he took 33 putts on disconcertingly slow, bumpy putting surfaces at Wentworth, including a three-putt at 14.
The World No 2 actually performed with distinction early-on and looked almost certain to break par for the first time on Thursday in six appearances at the European Tour's annual showpiece as he breezed to three-under through 12 holes.
However, he then made five bogeys in his final six holes as he opened with 74 for the fourth time at Wentworth. "It was just one of those rounds I let slip through my fingers," said McIlroy.
Asked if intense media speculation about his impending split with management company Horizon and a fraught press conference on Tuesday had unsettled him, he insisted: "No, not at all.
"I just didn't get a whole lot out of the round. Even when I went three-under through 12, I felt it could have been a little bit better and when things started to not go my way, I really didn't hold it together too well."
McIlroy's putting held him back at the Masters, the Players and once again yesterday. In fairness, conditions were difficult as a thunderstorm caused a 90 minutes halt to play. Luke Donald hit a shocking 78.
McDowell (pictured) confessed he usually finds Wentworth "long and a bit of a slog" on cold, damp days like these. So the Portrush man's disappointment almost was palpable after a double-bogey seven at the last undid a fairly decent day's graft.
McDowell's relationship with the 18th is fraught. He made an unfortunate eight at this quirky par five on his way to a first round 74 last year. Yesterday, McDowell final tee shot landed in a right fairway bunker. After laying-up, he was shocked to see his apporach fall short into the hazard in front of the green.
"I'm disappointed with the finish more than anything. I feel a bit beaten-up right now because I thought my third into 18 was a good shot. I was licking my chops with a 6-iron all over the pin and it got knocked out of the sky.
"I'm in great form. I'm swinging the club great. I'm feeling great," said McDowell, winner of last Sunday's Volvo World Match Play, his second tournament victory in five weeks. "Just sometimes you get to golf courses which don't fit your eye 100%."
Still, his and McIlroy's sunny disposition in each other's company was illuminating.
"Whatever happens between Rory and Horizon Sports, the last thing I want is that we lose our friendship," said the Portrush man. "And that's not going to happen."
Strain showed between the two Ryder Cup, Seve Trophy and World Cup partners in recent days when McIlroy was irked by remarks made by McDowell under media questioning about the Holywood native's desire to set-up a management company of his own.
"After I explained to Rory where I was coming from, he understood," said McDowell. "We have no problems. He's a great player, a great friend and our friendship is not in jeopardy."