Henderson, who won by eight shots in 2015 and by four last year, produced and eagle six birdies and an three bogeys during her afternoon round to join Lewis, who had reeled of a stunning 64 earlier in the day, and Chun, who played in the group ahead, at 10 under par, that trio edging two shots clear of the field.
Lewis, the owner of 11 LPGA Tour titles, has not won for more than three years but today she showed why she has been such a standout player on the LPGA Tour in recent years and having played well in recent starts and been twice runner-up in this event there were many who felt she would do well.
“It was probably one of the easiest rounds of the year, to be honest,” said Lewis. “Kind of had a lot of rounds where I was having to fight through it. It was one that I just felt like I could make a lot of birdies. Haven't felt that way in a while, so it was really nice.
“I was hitting the ball good last week, so I was excited about coming here where I have played well before and you have to it hit it good, you have to hit it straight. Just kind of had good memories and good momentum coming into the week.
Henderson bogeyed her first hole today, the highlight of her round coming at the 11th when she holed out from the fairway for eagle. It kick started her round as she added three birdies in the next four holes to reach the outright lead before dropping a shot.
“It was pretty cool," said The Canadian. “It was a really tough shot, and to see it go in just made me really happy. That kind of changed my day. I was able to go I guess 4-under par after that point, which was really important and helped me get to 10-under par today.”
Chun has been four times runner-up this year and is playing this event for the first time but she built on her opening round of 66 with 68 today and the battle between the three leaders promises much over the weekend.
Leading Australian, Sarah Jane Smith, recovered from a slow start to the event yesterday with a round of 67 today and is six shots from the lead and in a share of 24th position.
Katherine Kirk and Su Oh also recovered from slow starts to just make the cut and be tied for 63rd.
STACY LEWIS SWING THOUGHT