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Story summary
- Jordan Spieth warned that legal sports betting is fueling hostile crowds at PGA Tour events.
- He said the June 21 heckling of U.S. Open champion Wyndham Clark at Shinnecock Hills may be tied to bets of $100-$10,000.
- Spieth explained that close-range galleries let fans shout during a backswing, a risk not found in most sports.
- The PGA Tour issued new gambling-harassment reporting guidelines and trained volunteers to watch crowds.
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