Pressel recorded the best round of the day when she added a second round curse record of 64 to move into a share of the lead with Lee who is looking to extend the run of Korean born golfers to have won every LPGA Tour event this season.
Two of the tournament's heavyweights, Lydia Ko and Stacy Lewis, are just three off the pace and tied for 9th.
Karrie Webb slipped from 3rd to 46th after her second round of 75 left her eight shots from the lead.
Sarah Jane Smith is on the same score.
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