McIlroy and Fowler’s rivalry escalated last year so it was fitting that they were paired together on Thursday, and although the American was in the ascendancy for most of the day, the world number one rallied with birdies at five of his final seven holes.

They both carded respectable five-under 67s to sit in a tie for eighth, although their efforts were put in the shade by three-time champion Kaymer, who tops the leaderboard three shots better off.

“I was just trying to keep up with this guy,” McIlroy told the European Tour’s official website as he stood alongside Fowler.

“He was kicking me on, for sure. I didn’t want to let him get too far ahead of me. I just wanted to try to stay as close to him as possible and thankfully I was able to do that.”

One fantastic shot proved the springboard for McIlroy’s flourish on the back nine.

He was level par as he approached the third – his 12th – hole and a wayward tee shot, symptomatic of his round, left him on the lip of a bunker, 95 yards from the pin.

Facing the prospect of going over par, the off-balance Northern Irishman somehow managed to find the green before putting for the first of three consecutive birdies.

“It’s not a shot I would practise too much, that’s for sure,” he said.

“But from looking like you’re going to make a bogey to making a birdie, that gives you a little bit of momentum and you can go on from there and luckily I was able to make a few birdies after that.

“The result was good, 67 was pleasing. How I got there in the end wasn’t quite as pleasing. There’s a couple of things that I need to work on if I want to have a chance to win.”

Fowler, making his debut in this tournament, built on his start on the back nine with birdies at the first, fourth, fifth and seventh, but blotted his copybook with his only bogey of the day on his finale hole.

Nevertheless, he was satisfied with his display in only his third event since last September’s Ryder Cup.

“I was a little shaky this morning,” he said. “I haven’t played in quite some time, so it’s nice to get things off to a consistent start and throw some birdies in there.”

The pair will be firmly in contention when they resume on Friday but it is McIlroy’s Ryder Cup team-mate Kaymer who is out in front.

Martin Kaymer leads

The German was four under after his first eight holes and although he dropped a shot before the turn, he began his back nine with back-to-back birdies.

He dropped another shot at the 12th but for the second time in his round, followed up a bogey with a birdie at his next hole, before then moving joint top with his ninth birdie of the day two holes later.