Golfer's caddie unable to get to Open Championship due to 30-year-old cocaine charge

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Harris English will be playing in next week's Open Championship at Royal Portrush, likely without his tournament sidekick. 

English's caddie, Eric Larson, is currently stuck in the United States after being unable to obtain a new Electronic Travel Authority (ETA) visa for travel to the U.K., a regulation that now applies to Americans.

Thirty years ago, Larson pleaded guilty to sending cocaine to friends in the Midwest. Though he wasn't a user or big-time dealer, he spent 10 years and three months in prison and was released from a halfway house in June 2006.

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Harris English (right) pulls out his club next to caddie Eric Larson (left) on the 11th hole during the first round of the Sony Open golf tournament at Waialae Country Club.  (Mandatory Credit: Kyle Terada-USA TODAY Sports)

Larson said he didn't realize he needed the ETA visa until the U.S. Open, and when he filled out the form, he was denied. Grounds for refusal include an applicant who has been convicted of a criminal offense in the U.K. or overseas for which they served 12 months or more in prison.

"I guess the United Kingdom doesn't look highly on his past," English said Tuesday at The Renaissance Club ahead of the Scottish Open. "And apparently it's a work in progress."

Team USA caddie Eric Larson, left, takes a photo with Harris English during the official 43rd Ryder Cup portraits at Whistling Straits. (Samantha Madar/USA TODAY NETWORK-Wisconsin via Imagn Content Services, LLC)

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English, who is No. 19 in the world and 10th in the