Hackers have broken into servers belonging to PGA of America, which runs the PGA Championship golf tournament.
Files containing marketing materials for that competition as well as the Ryder Cup in France have been locked, pending payment of a ransom.
A Bitcoin address was provided, but the hackers did not specify a desired amount, according to sports magazine Golfweek.
A PGA spokesman told BBC News he had no comment as the incident was ongoing.
He did add, however, that the PGA Championship would not be affected.
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