(Reuters) - South Africa's Ernie Els held off final round challenges from Thomas Bjorn and Alexander Levy to seal a one-shot start to finish victory at the BMW International Open in Munich on Sunday. The British Open champion led the field from the opening round and started Sunday tied with France's Levy and Sweden's Alex Noren. The 43-year-old's lead slipped during the final round to both Denmark's Bjorn and tour rookie Levy, but his third consecutive card of three-under par 69 was enough for an 18-under par total, following his stunning 63 on the opening day. ... More...