Luke Donald eight shots behind at the Zurich Classic as he attempts to take golf's top spot from Rory McIlroy The American had birdies on the second, sixth and seventh holes but bogeys on the eighth, 10th and 16th meant he needed a birdie on the 18th to finish the first round under par. Duke had seven birdies in a bogey-free round, while Tringale - who is also seeking his first win on the PGA Tour - recovered well after a bogey on the third, finishing with four birdies. South Africa's Ernie Els, Sweden's Daniel Chopra and United States duo Steve Stricker and Chris Stroud are a shot behind the leaders on six under, with fellow Americans Ben Curtis, John Rollins and Jason Dufner on five under. Northern Ireland's Graeme McDowell and Scotland's Russell Knox are the best-placed Britons after the first round, on three under par. England's Greg Owen was two under after the first round, with Brian Davis a shot further back alongside Watson. Justin Rose managed a level par opening round, while Gary Christian was on three over.