Ilonen birdied the last hole at the Arlandastad course, closing with a 2-under 68 to finish with a 6-under 274 total. It was the second European Tour victory for the former British amateur champion. The Finn won his first tournament at the Indonesia Open in February.

"Everything can happen in golf and it did today," Ilonen said. "It was an unbelievable feeling to walk up to the 18th. If I had to pick one tournament to win, alongside the majors, it would be this one."

Kaymer missed the green and failed to save par to force a playoff. He chipped short to the green, the ball rolling halfway back down on a steep slope. The double-bogey dropped the German to a 73 and a tie for second with Jean-Baptiste Gonnet (68), Christian Cevaer (69), Peter Hedblom (69) and Nick Dougherty (70).

Corey Pavin shot 67 and was tied for seventh at 3 under. Tournament host Jesper Parnevik of Sweden (68) finished at 5 over.