Sei Young Kim keeps lead in LPGA finale

Sei Young Kim hit her best shot on the final hole, leaving her a tap-in birdie for a five-under 67 that kept her lead at two shots in the Tour Championship and moved her one step closer to the richest prize in women's golf.

As Kim held her advantage, Su Oh kept herself in contention as the best of four Australians in the field.

Oh carded seven birdies in a round of 67 to follow up her 69 to put herself four shots from the leader.

Katherine Kirk is five shots behind Oh after shooting 69 while Minjee Lee dropped out of contention with a disastrous four-over par 74.

Lee is one-over for the tournament while Hannah Green is at three-over.

Caroline Masson of Germany holed a 40-foot birdie putt from off the 18th green for a 66 to get within one shot until Kim answered with a birdie.

Kim was at 12-under 132.

Nelly Korda battled Kim all day for the lead until she missed a two-foot par putt on the 16th hole, and then lost a chance for an easy birdie on the par-5 17th with a hooked tee shot that finished under a tree.

The winner gets $US1.5 million ($A2.2 million).