Published: Sep 08, 2011 8:57 PM EDT
Updated: Sep 09, 2011 6:30 AM EDT

HILVERSUM, Netherlands (AP) - England's Simon Dyson shot an opening round 5-under 65 Thursday to tie for the lead with Marcel Siem on a day marred by vandals and torrential rainfall.

Play was delayed for 45 minutes after vandals dug up parts of four greens at the Hilversum Club. Heavy rain later soaked the course, forcing players off for more than three hours.

Despite the delays, Dyson had an eagle at the 484-yard, par-5 12th and finished with five birdies and two bogeys. He won the event in 2006 and 2009 on the Kennemer course. Germany's Siem also had an eagle on the 12th and finished with four birdies and a bogey in his 65.

Defending champion Martin Kaymer struggled to a 74.

Lee Westwood and Rory McIlroy were among 78 players not completing their first round because of darkness.