After building a lead through one round in Mexico, Christina Kim did just enough to remain atop the standings at the halfway point. Here's how things look after 36 holes of the Lorena Ochoa Invitational, where Kim holds a one-shot lead:
What it means: Kim again got out of the gates quickly, with birdies on three of her first four holes, though she cooled somewhat from there. Still, a 3-under 69 left her just ahead of Creamer as she looks to win on the LPGA for the first time since 2005.
Round of the day: Creamer got off to a hot start and never slowed down, with birdies on three of her first four holes en route to an outward 32. She added three more circles in a four-hole stretch from Nos. 11-14, and her 7-under 65 moved her into solo second place as she looks to win for the second time this year.
Best of the rest: Like Creamer, Pettersen started her round in style with a birdie on the first hole followed by an eagle at the par-5 second. The Norwegian hit every green in regulation during her second-round 66, moving from the middle of the pack to well within striking distance of the lead heading into the weekend.
Biggest disappointment: On a day when more than half of the limited field gathered in Mexico managed to break par, Anna Nordqvist failed to record a single birdie. The Swede struggled on the greens, taking 37 putts to complete a 2-over 74 that dropped her into a tie for 23rd, 11 shots off the pace.
Main storyline heading into Saturday: Kim remains the player to watch as she looks to end a lengthy victory drought, but the cast of characters chasing her includes two of the top four in the Rolex Rankings: Ko, No. 3 and the newest LPGA Rookie of the Year, and fourth-ranked Pettersen. Creamer is her nearest pursuer, looking to add another trophy to her collection after a dramatic victory in Thailand in March.