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has become the latest golfer to withdraw from next month's Rio Olympics due to fears over the Zika virus, the American announced on Friday.
The 32-year-old joins world number one Jason Day, fourth-ranked Rory McIlroy and world number eight Adam Scott as top 10 golfers who have opted out of Rio.
"This was not an easy decision for me, but my concerns about the Zika Virus cannot be ignored," Johnson said in a statement.