McGinley said: "I played Wentworth the way it should be played, with course management, strategy, good shot-making, knowing what pins to go for and what pins to play away from."
Peter Lonard of Australia, New Zealand's Michael Campbell and former Open winner Ben Curtis, from America, were in the clubhouse three shots in arrears of McGinley .
One player who probably won't claim a share of the £2.7million prize money is England's Malcolm Mackenzie, who was hit with a four-stroke penalty for starting the round with an extra club in his bag.