Last fall at Aronimink Golf Club in Newtown Square, Pennsylvania, a construction crew dug a new tee box. [music] They built it on the opposite side of an active maintenance road. The 18th hole now plays 490 yards uphill to a [music] terrace green. The director of agronomy at Aronimink is named John Gosselin, a 40-year member of the Golf Course Superintendents [music] Association of America. The golf course superintendent reporting to him is named Dave Stockton.
The chief championships [music] officer of the PGA of America is named Kerry Haigh. Those three men with their teams set up this course against the three top favorites in the field. None of those favorites had [music] a vote. This isn’t a tournament where the course passively waits to see who plays best.
Three players were chasing the Wanamaker trophy this week, Scottie Scheffler, Rory McIlroy, Cameron Young. The course was set up [music] against specific skills that happen to be each favorite’s relative weakness. Those decisions were made months ago. Gosselin and Haigh’s teams uh locked them in March and April.
The pin sheet was printed before any favorite >> [music] >> knew which hole he would tee off on first. Crews dialed back the mow heights over weeks, not [music] days. The new back tee on 18 was approved by the club, surveyed, dug, sodded, and [music] grown in last fall. By the time the favorites walked onto the property, the test was finished.
The only thing left was for them to [music] take it. Aronimink has hosted 18 professional events in John Gosselin’s career here. 13 of those were McDonald’s LPGA Championships. None was a men’s major. The last men’s major at this property was the 1962 PGA [music] Championship.
Gary Player beat Bob Goalby by one stroke. Gosselin wasn’t yet a superintendent that year. [music] Donald Ross had been dead for 14 years. The setup playbook in the Aronimink office for [music] a men’s major is being written for the first time in 64 years. That blank page condition is itself part of the test.
Most majors recycle setup templates. A team at Augusta National can pull 30 years of Sunday pin sheets and weather records for the second week of April. The USGA keeps championship moisture data across decades of venues. Aronimink has an LPGA history and one men’s major footprint from 64 years ago.
The setup decisions [music] for this week were built from first principles. A team that hadn’t made them before was making them at championship scale >> [music] >> for this field of players. The course tests three specific skills. The first is approach precision into [music] TifEagle greens.
Average green size is 8,200 square feet. Pin positions rotate across four corners. The hardest pin tends to land on the weekend. >> [music] >> The second is putting on cool-season bent grass in May Philadelphia humidity. The greens are mowed to championship spec and [music] rolled to the day’s moisture and wind targets.
The third is closing holes. Per Golf Digest championship preview, the new tee on 18 added nearly 30 yards last year. That brings the 18th into the same weight class as the closers at Merion and Oakmont. If you golf at all, you watch this channel for a reason.
The superintendent’s view of every course you’ve ever played isn’t the view the broadcast gives you. That’s the entire purpose of the Daily Greenskeeper. Five videos this week cover the Aronimink setup. This one’s the third.
Scottie Scheffler is the defending PGA champion. He won at Quail Hollow last year. Between him and McIlroy, the two of them have won four of the last five [music] majors. The expected story coming into this week was Scheffler in cruise control.
That’s not the data. Per recent CBS Sports coverage, Scheffler ranks 40th in strokes gained approach on the PGA Tour this season. For the prior 3 years, he ranked first [music] in that category. The slip isn’t small.
Aronimink’s TifEagle greens, averaging 8,200 square feet, test approach precision more than anything else. That’s the skill Scheffler has slipped on. That’s not coincidence. The setup decisions were finalized before his stat trend turned.
He’s walking into a test that was waiting for him. Rory McIlroy played Aronimink in 2018 at the BMW Championship. He was one of four players to shoot the course record, [music] a 62, during the middle rounds. Tiger Woods, Kevin Na, and Tommy Fleetwood were the other three.
McIlroy knows this property. He’s gone low here before. He’s also the back-to-back Masters champion with wins in 2025 and 2026. He’s won the PGA Championship twice before.
He opened today’s round one at four over 74. Asked to describe the round, he used one word. The word [music] rhymes with hit. He made five bogeys in his closing six-hole stretch.
He missed makeable putts down the stretch. Knowing a course and beating a course in major setup aren’t the same thing. The 2018 BMW was a regular tour event. This is the PGA Championship.
The rough is 3 and 1/4 in. Pins are set by Kerry Hayes’ team across four corners. Green speed is [music] pushed past the comfortable point. McIlroy’s record here is a hot card on a soft setup. [music] Round one is what the cold setup version looks like.
Cameron Young drives the ball as far as anyone in the field. >> [music] >> He ranks near the top of the PGA tour in strokes gained off the tee. >> [music] >> The new 490-yard 18th tee was built for closing power. That part Young has. The part Aronimink tests against him is the part that’s held him back through his career, putting. Cool-season bent grass and May’s humidity, mowed and rolled to championship stimpmeter range, makes that weakness impossible to hide.
He hits the green. The course makes him three-putt. The favorites, three different statistical profiles, three different weaknesses, three setup decisions made before any of them touch the property. That’s the test.
The setup decisions themselves aren’t classified. The methods are documented at the USGA Green Section and at Penn State Extension. The Green Section Record article on championship preparation describes the standard sequence. Mow heights are lowered in stages down to 1/10 of an inch.
Greens are dried to roughly 10% volumetric water content through hand watering with USGA moisture meters. Double cutting runs morning and evening. Lightweight rolling runs daily. A growth regulator like trinexapac [music] ethyl gets applied through the prep window.
A Penn State rolling study from 1994 documented ball roll gains of 5 to 11 inches farther after rolling. The study used Penncross creeping bentgrass on USGA sand-based greens. The methods are [music] public. The execution is the test.
Whether a given green hits its Stimpmeter target on Friday morning at 10:00 depends on the day’s wind and humidity. It also depends on decisions made by John Gosselin and Dave Stofanac 2 weeks ago, last week, and at 4:30 this morning. Pin position is the other axis. Section 5E of the USGA’s committee procedures sets the general framework.
Rule 15-3 of the USGA Handicap Manual lays out the technical specifics. The hole sits at least four paces from any edge of the putting surface. Around the hole, a radius of at least 2 feet should be as nearly level as possible. A green can hold between 24 and 36 legal hole positions, depending on size.
Over 4 days at a championship, the pin walks across those positions. The USGA’s general guidance in Rule 15-3 section 7 explicitly rejects making a course progressively more difficult by day as fallacious. In practice, at every modern major, the hardest pins tend to land on the weekend rounds. The first reading of the 4-day pin sheet at Augusta National happened weeks ago.
The room contained the Gosselin team and Kerry Haesty. Not the favorites, this is what Augusta National does at the largest scale. 18 separate maintenance crews, one per hole, run 18 different Stimpmeter targets across Masters week. Some greens are calibrated to 12 feet, some are calibrated to 15. The 12th never runs above 13 because the back-to-front slope into Rae’s Creek would push them approach shots into the water at higher speed.
SubAir systems vacuum moisture from under every green in minutes. The bent grass [music] is hand mowed at 1/8 of an inch multiple times daily. Augusta doesn’t publish green speeds. The reason they don’t publish is [music] that each green is intentionally different.
The favorites at the Masters have played Augusta many times across their careers. The course rewards familiarity built over years. This is what Aronimink does at the next scale down. One unified setup team, one stimpmeter [music] target across all 18 greens within reasonable hole-to-hole variance.
A championship playbook being written for the first time in 64 years. Mowing, rolling, moisture work, growth regulator applications, [music] all of it done by hand and by mower and by judgement. The crew is 30 agronomy staff plus 85 tournament volunteers from 65 clubs across four countries. Almost [music] no one in the field has played Aronimink at championship setup.
The last men’s major here was in 1962. Most of the favorites are solving the course during the tournament, not before it. That’s the difference between Aronimink and Augusta. [music] Augusta rewards a decade of memory. Aronimink rewards whoever solves the test first. [music] This is what your home course does at your scale.
One superintendent, setup decided Friday afternoon. Moisture managed with a garden hose, a pin [music] sheet that gets reshuffled when the men’s group complains. Bent grass responds to temperature, water, mow height, and rolling identically at every one of those scales. The biology doesn’t change.
The scale does. A few of the favorites have noticed. McIlroy, Schauffele, and Rahm have publicly criticized the course this week. The complaint targets what Hanse and Wagner removed during the 2017 restoration.
Trees came down across the property to bring the corridors closer to what Donald Ross built in 1928. The complaint is that the course is too open. That complaint is also a data point. When the best players in the world publicly complain about the setup at a major, [music] the setup is doing its job.
That complaint happened before the first round was done. That’s how Kerry Haigh has run 30 years of PGA Championships. No agenda, no winning number target. Read what the course gives.
Justin Rose is in this field. He won the AT&T National at Aronimink in 2010. He made the playoff at the 2018 BMW and lost it to Keegan Bradley. He’s won here at championship light setup and lost here at championship light setup.
He’s the one favorite in this field who knows the property at every grain and every fold. Watch where Sunday’s pins land relative to his career averages on this course. Saturday’s video covers what’s buried under the playing surface itself. Next week’s video covers the specific cultivar at Aronimink and what cool season May humidity does to it.
The favorites will complain this week. The bogeys will come in clusters. The four-corner pin rotation will put a Sunday hole close to a sand trap edge. The broadcast will show the player.
The player will sometimes shake his head. The player will sometimes say nothing. The player will sometimes shoot four over and describe the round in one incredible word. The broadcast will frame it as the player’s failure.
The setup won’t appear in the frame. You’re watching this week’s championship through a broadcast lens that focuses on the players. The story isn’t on the players. The story sits in the agronomy shed at 5:30 in the morning.
It sits in the conversation between John Gosselin and Dave Stofanac before the crew rolls out. The story [music] sits in the room where Kerry Haigh’s team finalized the pin sheet weeks ago. The story sits under the maintenance road where the construction crew laid the sod for the new tee on 18 last fall. They worked after the members had played their final round of the season.
Your home course superintendent [music] does the same work every member guest weekend at the smallest scale. He sets up the property, picks pin [music] positions, decides mow heights, runs the rollers if his staff allows. The visiting players walk [music] in cold. The locals know the greens.
The visitors complain. The visitors fly home and tell their friends the conditions were unfair, the pins were impossible, the greens were tricked up. [music] their friends not. Their friends weren’t there. The course wins.
Iron a mink is that scaled up to the largest version of itself in front of cameras. Three skills the favorites came in weakest at. Three set up decisions made before any of them [music] arrived. Now you know what they do before you tee off.