With preferredlies and soft conditions, scoring was low on a course with a fearsome reputation with only 10 players in the 70-strong elite field over par.
His eight-under-par round equalled the course record at Saujana's Palm layout, known as "The Cobra'", but will not count for record purposes due to the preferredlies in operation.
But due to preferredlies being in operation, where a player can clean and place their ball as long as it is on the fairway, due to several parts of the course being wet from over watering, Ko's 63 will not go into the record books.