Lydia Ko has a lot of work to do if she wants to add a third major title to her impressive resume.

Back to back bogeys on 17 and 18 has seen Ko slump to a two-over par 74 in the first round of the British Women's golf Open at Woburn in England.

The world number one is near the tail of the field in a share of 94th, 12 shots off the pace set by Korean Mirim Lee, who shot a remarkable 10-under par 62.

Thailand's Ariya Jutanugarn is three shots behind Lee in two place after firing a 65.