Valenzuela, 21, of Switzerland, a rising senior at Stanford University who is No. 5 in the Women’s World Amateur Golf Ranking, needed 19 holes to edge feisty high school sophomore Megha Ganne, 15, of Holmdel, New Jersey, in Saturday’s first semi-final.

Ruffels, 19, of Victoria, a rising junior at the University of Southern California who is No. 52 in the WAGR, was also taken the distance against Valenzuela’s Stanford teammate and World No. 2 Andrea Lee, 20, of Hermosa Beach, California, before posting a 2-up victory.

This sets up just the third championship match between a pair of international players in the event, and the first since 2016 when Eun Jeong Seong, of the Republic of Korea, defeated Virginia Elena Carta, of Italy. The only other final between two international players took place in 1910.

Valenzuela, the 2017 Women’s Amateur runner-up, and Ruffels, the winner of last month’s North & South Women’s Amateur at Pinehurst, are each seeking to win their country’s first Women’s Amateur title. Lindy Goggin (1981) and Anne-Marie Knight (1995) are the only Australians to previously advance to the title match.

Ruffels will play Switzerland's Albane Valenzuela in the 36-hole final on Sunday. PHOTOS: Top and Above Copyright USGA/Steven Gibbons.

Lee, making her seventh and likely last U.S. Women’s Amateur appearance (she plans to turn pro after her final season at Stanford), saw her dream of reaching the final end in the semi-finals for the second time in five years. The first came in 2014 as a 15-year-old.

An overnight storm brought nearly two inches of rain to the course, making the 6,425-yard layout play even longer and more difficult, especially when shots found the 2½-inch deep bermudagrass rough.

But the grind of the long week perhaps had more of an effect on the competitors as none of the four duplicated their birdie fest of the previous day.

Valenzuela, who played bogey-free golf in her quarterfinal win over Aneka Seumanutafa, built an early 3-up lead on Ganne, a four-time Drive, Chip & Putt national finalist, winning the par-5 second with a par and the par-4 fourth with a bogey. Then she started to struggle on the greens, three-putting the sixth green – she lipped out a four footer – to lose the hole and missing a seven footer for birdie on No. 9, eventually losing the hole when Ganne converted from four feet.

Ganne, however, showed no quit after Valenzuela regained her 2-up advantage on 12, thanks to a winning par. Two down with five to play, Ganne drove the 236-yard, par-4 14th hole and converted the 12-foot eagle putt and followed up those heroics with an up-and-down birdie from the pine straw on the par-5 15th hole, nearly holing out the 50-yard pitch-and-run.

Ruffels defeated World No.2 Amateur Andrea Lee on the 18th hole of their semi-final match. PHOTO: Copyright USGA/Steven Gibbons.

“That was probably the highlight of my week just because that’s what you play these events for,” said Ganne, a product of The First Tee of Essex County (New Jersey). “Pars are nice, but when you get under pressure and people are watching and you’re in a match and you’re down and you pull off just two incredible shots like that, it really just feels good, and you can hold on to those memories for a long time.”

On the par-3 17th, Ganne’s tee shot landed underneath the lip of a greenside bunker and she was forced to take an unplayable lie. She eventually conceded Valenzuela’s birdie to go 1 down heading to the closing hole.

But the 18th hole, a par 4 that sharply doglegs left around a large pond, had been good to Ganne all week. She won the hole against 2019 U.S. Women’s Open low amateur Gina Kim in a 1-up, Round-of-64 victory on Wednesday. The next day, she birdied the hole to extend the match against Bentley Cotton (19-hole win) and then won the hole again in the Round of 16 that afternoon against No. 64 seed Emily Hawkins, eventually winning in 20 holes.

On Saturday, she would win it again, this time with a conceded birdie when Valenzuela failed to get up and down for par from greenside rough after her approach nearly found the penalty area. Ganne had stuffed her approach to six feet.

Valenzuela, a veteran of 11 major championships (she shared low-amateur honours in the Evian Championship two weeks ago) and the 2016 Summer Olympics (T-21), composed herself walking to the 10th tee, the first extra hole.

“I told myself, do not regret this,” Valenzuela said. “Do not let it slip off your hands. You have control over it. And even when you start feeling a little nervous, I’m like, I want this. I wanted to go to the finals, and so that’s what you need to do to go to the finals is make birdie.”

Valenzuela made herself a prophet. She drained a 10-foot birdie putt and then watched Ganne miss left from eight feet to secure the victory.

“A win is a win,” said Valenzuela, who played the equivalent of 1-under-par golf, with the usual match-play concessions. “I didn't have my best game today. I missed some shots out there. But I just knew I had to stick to my game plan; eventually they’d fall, and it fell in the playoff, the one putt that I really struck well. It was a tough match. She’s a great competitor. She has amazing composure for a 15-year-old, and she made me work hard.”

Added Ganne, who is exempt into the next two U.S. Women’s Amateurs: “I'm ready to be back here again, and I’m ready to go to the final and win it in the coming years. I know that I have everything it takes. I’ve just got to test my game against really good players like Gin Kim in [the Round of] 64 and Albane, and I got to compare and see where they’re better and where I’m not, and I’m ready to work on those this winter, and I’ll be back next year.”

Ruffels, competing in her first U.S. Women’s Amateur, finally played the 18th hole for the first time since earning the sixth seed from the second and final stroke-play round on Tuesday. It went the distance because Lee took 14 holes to convert her first birdie. A tap-in on the shortened 14th trimmed Ruffels’ lead to two holes, Lee’s first win since she took the par-5 second when Ruffels three-putted.

Facing a make-or-go-home 15-footer for birdie on the par-3 17th, Lee converted to send the match to 18. It was similar to the clutch putt she made on Thursday afternoon on the 18th to force extra holes in the Round of 16 against co-medallist Alexa Pano, a match she won in 23 holes.

“I was actually kind of surprised early,” said Ruffels of Lee, a player she beat last October, 2 and 1, to secure the East Lake Cup for USC in the final against Stanford. “I knew that she didn't have her best stuff today, but I knew that she was clutch and that she was going to come in pretty strong. On 17, I knew she was going to make that putt. She does that stuff. I knew I just kind of had to keep calm, keep my head down, stay patient, and that’s what I did.”

On 18, after Ruffels knocked her 7-iron approach from 156 yards to nine feet, Lee’s shot from the fairway landed 22 feet above the flagstick, leaving a tricky birdie attempt. She took plenty of time studying the line, getting assistance from dad/caddie James before sending the putt six feet by the hole. Ruffels carefully trundled her attempt to three feet, and when Lee couldn’t make the comebacker for par, she conceded the match.

“I’ve never played a 36-hole final but starting the week this is where you want to be,” said Ruffels, whose victory over fellow Australian Doey Choi in the North & South final was over 18 holes. “No complaints. I’m really looking forward to tomorrow.”