Park outlasted Matthew to win the title in the three-hole playoff to secure back-to-back major championships.
Ko was happy with her final round effort. She teed off the 10th tee and had a solid outward nine making the turn in one-under-par 36. She carried that momentum on the homeward stretch with three birdies to open her second nine to get to four under for the day.
Ko dropped a shot on the par four sixth, her 15th, and then parred her way home to sign for a 69. She had rounds of 77, 70, 73 and 69 in a performance that once again underlined her world-class ability.
It could have been so much better for the youngest winner in professional history. She will rue her opening five over par 77 in the wet conditions and in round three she suffered a disappointing run. She opened with two birdies
before dropping six shots in a four hole stretch to lose touch with the top 10.
But she rallied superbly with four birdies and a bogey from that point to sign for a one over par 73 in an impressive display of resilience.