It was a good opening day at the PGA Championship for the Australian contingent with three players inside the top-10.

Jason DayQueenslanders Scott Hend, John Senden and World Number 1 Jason Day all fired opening rounds of 2-under 68 at Baltusrol to be tied 9th.

Teeing off the 1st in the morning field, Hend played a steady game through the front-9 with eight consecutive pars before finding his first birdie on the par-3 9th.

Back-to-back bogeys on the 10th and 11th threatened to derail Hend but he kept his composure to reel off three consecutive birdies in the middle of his round.

Senden's confidence was given an early boost when he recorded his first birdie of the 98th PGA Championship at the par-4 11th after starting his round on the 10th.

"I felt like I played really well today. I played solid early and got off to a good start," said Senden.

"I birdied the 11th hole which made me feel good. The conditions early were quite gettable, I thought."

Happy with his performance on the challenging layout, Senden will be riding momentum into the second round.

"I scrambled well today. Plus I hit a lot of good iron shots," added Senden.

"I think the golf course is really winning at the moment. It's bouncy, it's tough. I'm happy to be in the house at 2-under par. That gives me good momentum for tomorrow."

Day's limited preparations may have been a blessing in disguise with the World Number 1 getting his title defence off to a solid start.

"If you practice Monday, Tuesday and Wednesday, you could be pretty tired with how hot it was. It was in the mid to high 90s. You can get pretty drained pretty quickly," said Day.

"I'm glad I took Monday, Tuesday off, even though I'm a little bit under the weather. It was kind of a blessing really to come out yesterday, play 18 holes real quick and then get out of here."

"For the most part, I feel pretty good about where my head is at and looking forward to the next three days."

After a tough couple of weeks, Day is gaining confidence in his game.

"I'm pretty pleased. I'm very excited about how I hit it today. I hit a lot of good quality shots. It hasn't been like that lately," added Day.

"To be able to go out there and hit it exactly where I'm going. To see the shot and what I need to do and actually execute it was exciting for me. Really positive stuff going into the next three rounds."

Adam Scott and Aaron Baddeley are the next best of the Aussie contingent, each shooting even par rounds.

Marcus Fraser and Marc Leishman are both a further shot back, while Greg Chalmers and Matt Jones round out the Aussie contingent on 2 and 4-over respectively.