Lee Trevino famously said that golfers stuck in a thunderstorm should hold up a 1-iron.

Why?

“Because even God can’t hit a 1-iron,” he said.

Over the last 30 years, amateurs and PGA Tour pros alike have taken note, because there are much easier-to-use alternatives to long irons.

Today, 1-iron usage is a unicorn on the PGA Tour, replaced by 5-woods, 7-woods and hybrids. Even with the advent of hollow-bodied iron designs and more specifically designed driving irons that have kept 2- and 3-irons alive, pros seem to draw the line once an iron gets stronger than 17 degrees.

But not Ben An.

An won the DP World Tour and Korean PGA Tour’s Genesis Championship over the weekend in a playoff. The win will probably be best remembered for the driver off the deck he drilled on the 15th hole from 290 yards to within 10 feet when he was trailing by two, or his emotional celebration with his grandmother, who watched him win for the first time in their homeland.

But gear junkies might have noticed something else: Not only is An one of the few pros still carrying a 1-iron, but it’s also the longest club in his bag, other than his driver. He doesn’t have a fairway wood, which explains why he needed to hit driver into 15.

The 16-degree Titleist U505 driving iron has been in An’s bag since the Valspar Championship in March 2023; adding the club to An’s arsenal was an idea cooked up by An; his swing coach, Sean Foley; and JJ Van Wezenbeeck, Titleist’s senior director of player promotions. Van Wezenbeeck said they had been trying everything to find An a secondary option off the tee from strong-lofted 3-woods to high-lofted fairway woods.

“We kind of had run the gamut with Ben,” Van Wezenbeeck told GOLF.com. “He’s such an elite iron player that — the way he hits a fairway wood, he’s really up on it on a driver. But an iron, he really does a great job of controlling the face and compressing it. So his coach Sean Foley kinda looked at me and said, ‘We need something.’”

That’s when Van Wezenbeeck asked the pair if they were open to “anything.”

Like, say, a U505 1-iron.

The U505 is not the daunting blade 1-iron of yesteryear. As Van Wezenbeeck describes it, it’s an iron with more hybrid-like properties. It has a flat face, like an iron, but like a hybrid, it has a wide sole and low center of gravity. That low CG is helped by heel and toe tungsten weights, creating a higher MOI.

Although Van Wezenbeeck said the range at Valspar runs slightly downhill, An and Foley’s attention was piqued when they saw 265-yard carries out of the gate. The club, with a few tweaks here and there — including a switch to 41-inch Graphite Design Tour AD VF 95 X shaft before the Paris Olympics — has been in An’s bag ever since.

“I hit it high enough, I have enough speed, I have enough spin rates,” An said in a Titleist YouTube video earlier this year, “so why not try to build that iron that has really low loft, so I can hit it straighter off the tee? Because that’s the whole purpose of using the 3-wood.

“A lot of people are surprised by how high I can hit this one, and it’s been a great club off of the tee. I can hit it low, maybe 20, 30 feet off the ground up to like 120 feet off the ground.”

Titleist U505 Custom Driving Iron

$269.99

An extremely versatile, high-launching utility iron that now looks and feels dramatically better.
U•505 lets you reclaim your long iron game. Drawing on Tour input, the refined design provides the high, explosive launch you expect from a utility, now with a remarkably solid feel and sound.
U•505 is the ultimate, high-launching utility. A new, cleaner design creates more confidence at address, while the refined Max Impact Technology, reengineered chassis and new Variable Bounce Sole all improve the feel and overall performance. It all adds up to a versatile utility that plays like an iron.
TOUR-VALIDATED LOOKS
With a shorter blade and shallow face, U•505 sets up the way Tour Pros feel a utility should. Now with an even cleaner design, there is nothing to distract you from hitting the exact shot and shape your playing position demands.
ENHANCED FEEL
With distance as a priority for a utility, engineering feel becomes a unique challenge. For U•505, Titleist engineers use a refined Max Impact Technology with added dampening in the polymer muscle badge to guide the frequencies created at impact into the ideal player range.
IMPROVED OFF-CENTER ACCURACY
U•505 features a more stable, reengineered chassis and a lower CG position to help maintain speed and stability on strikes made away from center. The new single taper face improves performance towards the heel for tighter overall distance dispersion.
EFFORTLESS TURF INTERACTION
Working with Tour Pros and the grind experts at Vokey Design, our engineers were able to further improve our Variable Bounce Sole by softening the trailing edge to allow the club to flow faster through the turf, even after contact. A scoring iron refinement for one of the longest clubs in your bag.

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Surprisingly, An’s 1-iron model isn’t reserved only for the game’s elite or those who have access. The U505 1-iron is actually a retail offering from Titleist.

“During the testing with Tour players were like, Hey, this is this is kind of stepping over that threshold for that player that really doesn’t — or has scar tissue from playing a hybrid 10 years ago when they didn’t have the CG adjustability that we do today, and said I’m looking for something more iron-like,” Van Wezenbeeck said. “Should we make this down to 16 degrees? And as we look at the loft progressions, we were like, ‘That’s a 1-iron.’