Tommy Fleetwood made a blistering start to the Players Championship before thunderstorms forced the evacuation of TPC Sawgrass early in round one.
The Englishman was joint leader on four under par after 10 holes when the sirens sounded to signal players and fans had to leave the Floridian course.
Heavy overnight rain delayed the start of the tournament by one hour.
Play was suspended at 11:00 (16:00 GMT) with an announcement on the resumption of play expected at 14:30 local time.
Further disruption is expected with more heavy rain and electrical storms forecast for Friday and Saturday.
More to follow.