Captain of Team Europe Catriona Matthew (left) receives the Solheim Cup. Photo: VCG

Europe, fueled by rookies Matilda Castren and Leona Maguire, beat the United States 15-13 to retain golf's Solheim Cup on Monday.

Finland's Castren fired out of a bunker and drained her putt at the 18th to secure a 1-up victory over American Lizette Salas for the point that ensured Europe would retain the trophy it won in 2019 at Gleneagles in Scotland.

The Europeans came into the final day of the biennial match-play showdown between European and US women needing five points from 12 singles matches to gain the 14 they needed to take the Cup back home from Inverness Club in Ohio.

Ireland's Maguire - like ­Castren, the first woman from her country to play in the Solheim Cup - fittingly delivered Europe's first point of the day with a dominant 5&4 victory over Jennifer Kupcho.

Maguire, who had already partnered to deliver 3 1/2 points over the first two days in fourball and foursome matches, seized the lead with an eagle at the par-five second and never looked back.

"Just so proud of getting 4 1/2 points on the board for Europe," said Maguire, who became only the third player to earn 4 1/2 or more points in the Solheim Cup. "I just tried to get off to a really good start and that eagle on the second - couldn't have started any better than that." 

"Made birdie on six, which is a hole I haven't played well all week," said Maguire, whose approach at the sixth flew over the pin and left her an eight-footer for birdie.

"I just wanted to put pressure on Jen from the get-go," she added after sealing the victory with a par at the 14th hole.

Giulia Molinaro celebrates after winning the 2021 Solheim Cup in Toledo, Ohio on Monday. Photo: VCG

Sweden's Madelene Sagstrom, who was involved in a rules controversy on Day 1, put the next point on the board for Europe with a 3&2 victory over Ally Ewing.

And France's Celine Boutier polished off a 5&4 victory over Mina Harigae before a tense tussle between Sweden's Anna Nordqvist and Lexi Thompson ended tied, giving the Americans their first half-point of the day.

The Americans, backed by rowdy crowds, were able to dial up the pressure as the afternoon wore on.

World No.1 Nelly Korda was 2-down early but rallied to win a back-and-forth battle with England's Georgia Hall 1-up.

American Brittany Altomare, with the aid of a couple of monster putts, won four of the last five holes for a 2&1 victory over Spain's Carlota Ciganda. But after Denmark's Nanna Koerstz Madsen halved her match with Austin Ernst, the remaining six matches were must-wins for the United States.

Castren knew the stakes were high when she took a 1-up lead to the final hole against Salas, and she was elated after getting the job done.

"It's hard to put it into words," she said. "Right now I'm shaking. I was looking at the scoreboard, and I knew it was going to be an important putt. We read it perfectly and it went in. I'm just so happy now."