NEWTOWN SQUARE, Pa. – Round 3 of the PGA Championship is underway.

The stage is set for an electric weekend at Aronimink Golf Club. Scoring has been suppressed through 36 holes, but the course looks gettable on Moving Day and with such a compact leaderboard, the theatrics are sure to come.

We’ll be providing on-site updates all day long. So check back here to follow the action as it unfolds.

2:02 p.m. ET: Rory McIlroy has tied the lead at the 108th PGA Championship with a birdie at the short par-4 13th. He is now 5-under through 13 holes Saturday and 4-under for the championship.

As the wind begins to strengthen, McIlroy appears on his way to posting a number that could hold considerable weight on Sunday. Playing alongside Brooks Koepka in the 11 a.m. tee time, the pairing has moved briskly around Aronimink, reaching the final five holes in less than three hours. Possibly in an effort to complete as much of the round as possible before wind conditions worsen.

Following an opening-round 74, McIlroy’s odds to win drifted as long as +9000. Now, he may very well emerge as the betting favorite to win the Wanamaker Trophy and continue his pursuit of the calendar Grand Slam.

Of note, Michael Kim posted after his morning round: “If you miss in the rough, miss it wide and the rough is really trampled from the crowd.”

A detail worth monitoring as the weekend unfolds at Aronimink.

1:31 p.m.: And just like that, a new leader appeared to be emerging.

Chris Kirk looked destined to post the round of the tournament Saturday morning, carding eight birdies against a single bogey through 17 holes on his way to what appeared to be a 63, two shots better than anything posted over the first two days at Aronimink.

Instead, the golf gods had other plans.

A double bogey at the 18th dropped Kirk back to a 65, leaving him 2-under for the championship. Justin Rose joins him with a 65 of his own to tie the low round of the week thus far.

Just below, the game’s heavyweights are beginning to stir.

Rory McIlroy moved to 4-under on his day and 3-under for the week with a birdie at the 11th, while names like Sam Burns, Xander Schauffele, Jon Rahm and last week’s winner Kristoffer Reitan continue to climb this leaderboard.

It’s the kind of volatility major championship Moving Day is supposed to deliver.

12:19 p.m.: Just past noon at Aronimink, and the leaderboard is already undergoing a major reshuffling.

Warmer temperatures and calmer winds have opened the door to scoring. After chipping in for eagle on his final hole Friday to make the cut by a single stroke, Justin Rose has raced out in 30 on Saturday morning. Rose now sits T3 at 3-under par, carding six birdies without a bogey.

To put the shift in conditions into perspective, Saturday’s scoring average currently sits at 69.4, more than three shots easier than Friday’s 72.6.

Per Justin Ray, the average proximity on approach shots is nearly 8 feet closer at this point in the day Saturday than it was Friday.

Rose is not alone in the charge. Chris Kirk is 6-under on his round through 14 holes, while Brian Harman is 4-under through 13.

Rory McIlroy has already piled up three birdies through seven holes, narrowly missing on two other quality looks. It certainly helps when you can drive the green at the par-4 sixth, which is playing nearly 400 yards today.

While winds are expected to strengthen again this afternoon, the early signs point toward the kind of major championship Moving Day that could reshape this leaderboard in a hurry.

10:55 a.m.: Oh boy, do we have a birdie fest on our hands?

The talking point after 36 holes was how difficult the course was playing. Well, Aronimink is there for the taking early.

A few examples:

• Michael Kim, 5-under through seven holes without hitting a fairway
• Chris Kirk, 5-under through seven holes
• Justin Rose, 4-under through seven holes
• Padraig Harrington, 3-under through eight holes

What will this yield as the day goes on? The winds are expected to strengthen this afternoon, which could create quite an advantage for the players who are out on the course right now. But if the winds don’t pick up, expect these early scores to be just a blip as the top of the leaderboard feasts on the same setup. It’s a fascinating situation ahead.

10:00 a.m.: Here’s a few of the marquee tee times today before the leaders tee off.

• Jordan Spieth (1-over) and Dustin Johnson (2-over), 10:50 a.m. ET
• Rory McIlroy (1-over) and Brooks Koepka (1-over), 11:00 a.m. ET
• Rickie Fowler (1-over) and Xander Schauffele (1-over), 11:10 a.m. ET
• Patrick Cantlay (1-under) and Jason Day (1-under), 1:00 p.m. ET
• Scottie Scheffler (2-under) and David Puig (2-under), 1:40 p.m. ET
• Cameron Young (2-under) and Justin Thomas (2-under) 2:00 p.m. ET

Here's a look at the forecast, with warmer weather on deck, but winds still likely to kick up as our leaders tee off.

PGATOUR.COM'S Paul Hodowanic and Jimmy Reinman contributed to this report.