Kim has one of the longest winless droughts on the tour - her last victory coming almost a decade ago at the Tournament of Champions - and she came under pressure yesterday from Creamer.
Norway's Suzann Pettersen also had a strong day, shooting a six-under 66 and jumping into a tie for third with Ko, Thailand's Pornanong Phatlum (68) and Spain's Azahara Munoz (71). World No1 Inbee Park was 10th, six shots behind Kim, and No 2 Stacy Lewis was in a tie for 27th at two-over.
Kiwi professionals Danny Lee and Tim Wilkinson were in the hunt at the halfway stage of the OHL Classic in Mexico on the PGA Tour yesterday.
Lee (66, 69) and Wilkinson (68, 67) were in a share of 16th, five strokes behind American Michael Putnam on 12-under par.
Lee, who is 76th in the early stages of the Fed Ex Cup, made four birdies and two bogeys in his second round to drop nine places down the leaderboard.
Wilkinson, who is currently tied 99th on the season money-list, had five birdies and a bogey in his four-under par 67.
Waikato professional Steven Alker bounced back in round two with a five-under par 66 but still missed the cut by one stroke.
Ryan Fox's dream of joining the Web.Com Tour in 2015 is over.
The 27-year-old, who had carded rounds of 72, 71 and 74 to be in a share of 22nd place, needed a strong final round yesterday in Texas to advance to the final stage of qualifying.
Fox delivered a two-under par 70 to finish two shots outside of the qualifying mark - he needed to finish inside the top 18 players and ties to advance.
Thomas Campbell, Gareth Paddison and Mathew Perry also missed out.
Josh Geary and New South Welshman James Nitties will take a two-shot lead into today's final round of the NSW Open with US amateur champion Gunn Yang part of the chasing pack.
Nitties carded a 71 and Geary a 68 yesterday at Stonecutters Ridge in western Sydney to move the pair to 14-under-par for the tournament.