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 and play was suspended three hours after it started, at 11:00 (16:00 GMT).
Play resumed at 15:14 local time.
Further disruption is expected though with more heavy rain and electrical storms forecast for Friday and Saturday.
The first round will not be completed on Thursday with 72 players – exactly half the field – yet to start their first rounds and sunset falling at 18:31 local time.
More to follow.