Lawson, from Geelong, and Adelaide's Cullen held their nerve through six grueling rounds to finish in a share of 13th, well inside the required top 25.

Neither Australian carded a round in excess of 71 and finished six shots behind top-placed Spaniard Alejandro Canizares and South African Zander Lombard.

Lawson, 27, had a wobble during the final round with three bogeys in seven holes, but also found three birdies in his closing 10 holes to finish two shots inside the safe zone.

Former Australian Masters champion Cullen made his last bogey on the 12th hole of his fourth round and signed off his final round with a 69.