A four-hour weather delay was the only obstacle for Lee Westwood as the Englishman cantered to a seven-stroke win in the European Tour's Malaysian Open on Sunday to end an almost two-year trophy drought. The former world number one, leading by a stroke ahead of compatriot Andy Sullivan, carded a bogey-free final round of four-under-par 68 for a four-day total of 18-under. Austrian Bernd Wiesberger (67), South African Louis Oosthuizen (68) and Belgian Nicolas Colsaerts (70) finished tied for the second spot at 11-under. Once the 27-year old Sullivan found water at the second hole for a triple-bogey seven, there was no catching Westwood, whose last triumph came at the 2012 Nordea Masters in Sweden. Sullivan fought back with a hat-trick of birdies from the fourth but suffered an astonishing meltdown after that as he went on to drop six more shots to finish tied 13th with a final-round 78. Play was suspended for over four hours at the Kuala Lumpur Golf and Country Club due to a lightning threat but it provided no respite for the chasing pack as Westwood returned to sink two more birdies on the 13th and the final hole. The 40-year-old, who finished seventh at the Masters last week, credited the recent changes he had made to his game for the turnaround. "I started working with a new coach a few weeks ago, Mike Walker, and Billy Foster came back on the bag at the end of last year, so I was going back to what I had done before because it had worked," Westwood said after winning the US$2.75 million Asian Tour co-sanctioned event. "It's started to work already - the last couple of weeks I've played well in Houston and at the Masters last week and this week I've obviously played very well. "It's a golf course that suits my game; it's very tight in certain areas. "I played well, I putted well, and the short game is good."