How the PGA Tour Superstore is expanding amid a struggling retail landscape from CNBC.

CEO Dick Sullivan discusses PGA Tour Superstore's growth and the boost in golf retail due to the 118th U.S. Open golf championship. 

Click here for more information about the PGA Tour Superstore

Jordan Spieth's victory celebration after winning the 2017 Travelers Championship was just as entertaining as the shot itself. A celebratory display like that could be considered one best golf celebrations of all-time. Here are seven more of the best golf celebrations through the years:

James Hahn, 2013 Waste Management Phoenix Open

Although Phil Mickelson would go on to win this tournament, Jordan Hahn's recreation of the dance craze Gangnam Style after he birdies the 16th hole in the final round at the Briarwood Golf Club deserves a trophy of its own.

Everybody loves an underdog, right? Or, maybe you like, or dislike, when something that was supposed to happen in a golf tournament doesn't. Golf can be so unpredictable, even for those at the highest level of ability.

But what's the greatest upset in golf history?

Here's a look at some of the all-time great upsets:

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Any list that dives into the "greatest" at anything is sure to spark a debate.

Who's on the list and at what number? That's fine, even healthy, in fact. Ranking lists are, after all, a subjective matter.When it comes to a list ranking the greatest golfers of all time, there are so many factors that come into play. Things like number of PGA Tour wins, winning streaks, longevity and -- most importantly -- major victories.

With that, here's my list of the 15 greatest male golfers of all time.

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Xander Schauffele opened the Travelers Championship with a 3-under 67 using TaylorMade P750 irons. But it was the set he didn't have in play that had equipment enthusiasts talking this week.

Greg Moore, GolfWRX's roving photographer, managed to snap photos of an unreleased set of Callaway prototype irons in Schauffele's bag on Wednesday.

Normally a set of iron on TOUR is a heavy-handed hint that something new is in the retail pipeline. Only this particular cavity-back iron comes on the heels of Callaway's release of Epic Pro and an updated X Forged that both fit the requirements of a better player or professional.

Even more curious was the fact that Schauffele was the only player in the field at TPC River Highlands testing the iron.

So what's the deal with the prototype?