ZAndvoort, Netherlands:Ireland's Paul McGinley and Scotland's Gary Orr were tied for the early lead at the KLM Open after both shot a six-under 64 on Thursday.
Among the other finishers, defending champion Darren Clarke of Northern Ireland was a stroke further back in a group of four with Ireland's Peter Lawrie, Australian Matthew Millar and Spain's Jorge Campillo.
McGinley eagled the second hole and unleashed a string of birdies from the 12th-15th. A bogey on the eighth kept him from sole possession of the lead.
"It's not surprising that Gary Orr, Darren Clarke and I do well here: we grew up on courses like this," McGinley said.
"It's wonderful to play on an old-fashioned course where it's important to hit the fairway."
It was unclear whether all players would be able to finish Thursday, as severe storms were predicted for the afternoon at Kennemer Golf and Country Club near the Dutch coast.