Both players signed for opening scores of 3-under 68 but while Lee has moved to 4-under through 15 holes of her second and final round Oh is yet to tee off.
Organisers were forced to shorten the event to 36 holes after bad weather washed out the entire first round and most of the second though it is hoped there will be a result Sunday night.
Katherine Kirk and Hannah Green were the only other Australians to begin their second rounds, Kirk even par through 15 holes to be 1-under and T36 while Green is 2-over for the tournament through 12 holes and outside the projected payout cut off.
Karrie Webb (even par) and Rebecca Artis and Sarah Jane Smith (both 1-over) are yet to begin their second rounds.
Five players are tied for the lead at 6-under though none has yet completed all 36 holes.
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India’s Aditi Ashok is through 14 holes as is Denmark’s Nicole Broch Larsen while Mexico’s Gaby Lopez has played 11 holes.
Overnight leaders Sung Hyun Park and Jenny Shin are yet to begin their second rounds with Sunday shaping as a potential shootout with several players in with a chance.
Lee is part of a logjam of players at 4-under and T6 though with many of those yet to tee off will be looking to finish strong when she returns to play her final three holes Sunday.
Oh, who carded four birdies and a bogey in her opening round, comes off an encouraging week in San Francisco where a new set of irons saw her take a share of the early first round lead before fading over the weekend.
The 21-year-old has struggled for much of the season but gave credit to a new set of irons for her improved play last week.
If the weather co-operates Oh will hit off the 10thtee at 1.14pm local time Sunday alongside Kristy McPherson and Harang Lee.
SIGNATURE HOLES - 17TH AT HUNTINGDALE GOLF CLUB:
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