At this week’s US Open, there is an extra risk of disqualification awaiting golf’s biggest stars.The third major of the year begins on Thursday and sees Scottie Scheffler, Rory McIlroy and Bryson DeChambeau headline the field.The Hole 9 green at Oakmont is one of the most uniqueSports Illustrated / YouTubeBut every player will have to make sure to be fully focused, not only when in action during their rounds, but also when practising for it…And that is due to Hole 9 at Oakmont, which is a par four that covers a total of 472 yards and is home to a green unlike any other. As fans watch the US Open, they’re likely to notice the size of the green at the halfway point of the iconic course in Pennsylvania. Spanning 22,365 square feet, it is so big that it actually has two sections to it.The green uniquely doubles as both the ninth green and also the practice putting green.It means that during the tournament, players will be practising their short game ahead of their rounds on the top portion of the green. At the same time, players who are already on their rounds will be playing the ninth hole and trying to find the front portion of the putting surface. Now, that would surely lead to some problems, right? As players could be practising and potentially interfere with balls and shots in play?However, those practising have strict rules to stick to, and if they don’t, disqualification from the US Open would follow. There is a spray-painted line across the middle of the ninth green to show the point where players who are practising cannot pass. The green is split into two sections and could lead to disqualificationusopen.comThe entire green spans over 20,000 square feetSports Illustrated / YouTubeIf they pass that line, they will be disqualified from the tournament. But then what happens if a player hits their ball into the practice area of the green? Well, they don’t receive any official punishment for it. They actually still have to carry on as normal on the ninth hole, having to putt down to the front portion of the green, which will be a very hard task.It makes this hole at Oakmont one of the most difficult in the world, and it could prove to have an impact on the US Open this week. Scheffler is the favourite to come out on top and claim another major title, while DeChambeau defends his crown. The US Open is potentially going to be decided on the greensSports Illustrated / YouTubeBut with putting set to prove to be the key to success on Oakmont’s difficult greens, mistakes that department could make the difference. And it will likely be the player who excels in that regard who may taste victory. talkSPORT and talkSPORT 2 will have live coverage of all the US Open action across the tournament.To tune in to talkSPORT or talkSPORT 2 through the website, click HERE for the live stream.You can also listen via the talkSPORT app, on DAB digital radio, through your smart speaker and on 1089 or 1053 AM.