Englishman Lee Westwood shot a stunning final round 64 to easily win the season-ending $A8.2 million Dubai World Championship by six shots.

Heavy rain washed out Saturday play and forced officials to shorten the season-ending LPGA Tour Championship to 54 holes, to be completed on Tuesday morning AEDT.

Rory McIlroy fell victim to the tough closing stretch of the Earth course at Jumeirah Golf Estates as veteran Lee Westwood grabbed the advantage at the Dubai World Championship.

Sophie Gustafson climbed within two shots of overnight leader Lorena Ochoa at the LPGA Tour Championship as rain wreaked havoc on the second round.