England's Hewson and Northern Ireland's Mehaffey finished one over to qualify for the final round of the inaugural Augusta National Women's Amateur.
The full field of 72 players will have the opportunity to play a practice round at Augusta National on Friday. After two rounds at the nearby Champions Retreat last week, where the numbers were whittled down to 30, she began six shots off the pace.
Augusta's trademark lightning-quick and undulating greens took a toll on rivals as Kupcho and Fassi battled beneath the Georgia pines in fabled Amen Corner, women shining for the first time over some of golf's most famous holes.
In a dramatic battle between two 21-year-old U.S. collegiate stars, Kupcho had three birdies and an eagle in the last six holes in firing a five-under par 67 to finish 54 holes on 10-under 206 for a four-stroke victory over Fassi, who fired her third consecutive 70.
After pars at 17, Kupcho would close out the historic round in style by rolling in a long range birdie putt at the last to seal a comfortable victory.
Kupcho rallied to win the tournament with an eagle and three birdies in the final six holes.
"What I'm hoping is that showing these women in an iconic setting, to show their skills and the elite athletes that they are, is going to be very inspiring", Ridley said. Birdies by her opponent coupled with a bogey on No. 16 saw the Pachuca, Mexico, native fall behind. Things didn't improve as she shot an 82 on Thursday. She picked up another stroke on the par-4 1st, but she missed a short birdie putt on her 11th hole, the second of the Island Nine, and struggled with her swing after that.
"I definitely think my length will help".
This might have been the busiest Augusta National has ever been on the Friday leading into the Masters.
Augusta National´s all-male status led to a 2003 protest across the street from the club but it was not until August 2012 when businesswoman Darla Moore and former US Secretary of State Condoleezza Rice were named the club´s first women members.
"It´s just exciting to be a part of history", Lopez said.
The Augusta National Women's Amateur has all the trapping of the Masters. "It's going to be a lot of fun".
I was running a national women's organisation in 2002 and happened to see a piece written by a female sports reporter about how women were excluded from Augusta, so I just mentioned to my board, why not write these people a letter and urge them to open to women?