It's happening at Olympia Fields Country Club.
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There's a Pro-Am event later Wednesday morning.
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Vince Pellegrino, senior vice president of tournaments for the Western Golf Association, joined ABC7 Chicago to talk more about it.
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Pellegrino said the top 50 players in the world will be there Wednesday, including Rickie Fowler, Jordan Spieth and Rory McIlroy.
Fans can also hit some balls themselves and join in other activities at the event.
The championship takes place Aug. 15 to 20 at 2800 Country Club Drive in Olympia Fields.