Golf:Martin Kaymer and last week's winner Thomas Bjorn took over at the top with dazzling runs as the Omega European Masters tried to beat the weather in Switzerland today.

Kaymer, four behind Welshman Jamie Donaldson overnight, had two eagles and two birdies in the first eight holes to go two clear.

But Bjorn, three behind with a round to go just as he was in the Johnnie Walker Championship at Gleneagles, had four successive birdies from the fifth and when he made another from five feet at the 10th he joined Kaymer on 16 under par.

Lee Westwood was two behind at the turn and joint third with South Africans Keith Horne and Jaco Van Zyl and also Swede Fredrik Andersson Hed.

Rory McIlroy was alongside them after opening with two birdies but bogeyed the 10th to drop back to 12-under-par.

Tee-off times had been brought forward because of the threat of storms, but low cloud was causing problems as the tournament entered its closing stretch.