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Lydia Ko joined the party in what could be a wild weekend on the outskirts of Atlantic City, N.J.
Ko shot a 4-under-par 67 to climb onto a jam-packed leaderboard Friday at the ShopRite Classic.
Half the field enters the weekend appearing to have a chance to win, including Laura Diaz, a 43-year-old full-time mom and part-time player who moved into a share of the lead with her 12-year-old son, Cooper, as her caddie.
Diaz, Anna Nordqvist and Celine Herbin shot 66s.
A staggering 27 players are within two shots of their lead, with 48 players within three.