Iga Swiatek fought off a Karolina Muchova comeback to complete a hat-trick of French Open titles.
The 22-year-old Pole cemented her status as the best female player in the world, particularly on clay, with her third title in four years at Roland Garros.
But this was by some distance the hardest of her grand slam finals, with unseeded Czech Muchova battling back from a set and 3-0 down to force a decider.
Muchova twice led by a break in that but Swiatek refused to be beaten, eventually prevailing 6-2 5-7 6-4 after two hours and 46 minutes and crouching down on the clay in tears.
She is the first woman since Justine Henin in 2007 to successfully defend her title on the Paris clay and joins Naomi Osaka on four grand slam titles – veteran Venus Williams with seven is the only active player to hold more.
Swiatek joins Osaka and Monica Seles, meanwhile, as the only women in the open era to win each of their first four slam finals.
Muchova, a 26-year-old ranked 43, produced the performance of her life to beat second seed Aryna Sabalenka in the semi-finals, saving a match point and fighting back from 5-2 down in the deciding set.
But Swiatek had both the experience and a formidable record in finals to bolster her confidence, while Muchova was through to this stage for the first time.
She made a very nervous start and it appeared Swiatek may come up against little resistance but Muchova got on the board in the fourth game and the rest of the first set was competitive.
The Czech showcased the variety she has in her game against Sabalenka, keeping the Australian Open champion off balance with her court craft and willingness to come to the net, and she produced some standout moments here.
There were just too many unforced errors, though, while Swiatek was able to keep her favoured position in the middle of the baseline and dictate with her heavy forehand.
A second break of serve gave Swiatek the opening set, making her the first player, male or female, to win their first seven sets in grand slam finals.
When she moved 3-0 ahead again in the second, it seemed number eight was not far away, but Muchova dug in and broke Swiatek for the first time in the fifth game with a brilliant running forehand.
The majority of the crowd was willing her to extend Swiatek further and suddenly it was the Pole feeling the tension, with a double fault handing Muchova the chance to serve for the set.
She could not take it but another shaky game from Swiatek gave her a second chance and this time she made it over the line, clinching her third set point after a stunning all-court rally.
Muchova has struggled badly with injuries during her career and it was only last year that doctors told her she might have to give up the game.
She rode her momentum at the start of the decider by moving into a 2-0 lead as Swiatek threatened to implode but the 22-year-old pulled herself together quickly to level.
They exchanged breaks again in the seventh and eighth games, with Muchova unable to pull away, and Swiatek regained the ascendancy when she fought off another break point to hold for 5-4.
The pressure of serving to stay in the contest proved too much for Muchova, who made three errors before double-faulting on match point in a cruel end to an absorbing final.
Sinner guides Italy to back-to-back Davis Cup triumphs
Jannik Sinner capped his outstanding year by helping Italy retain the Davis Cup, beating Tallon Griekspoor to ensure Italy downed the Netherlands 2-0 in Sunday's final.
World number one Sinner overcame Griekspoor 7-6 (7-2) 6-2 after Matteo Berrettini had registered a 6-4 6-2 win over Botic van de Zandschulp in the opener.
Sinner saved the only two break points of the first set as Griekspoor put up a fight, but the Italian put on a show in the tie-break to inch ahead.
Griekspoor hit back after giving up an early break in the second set, but Sinner immediately responded with two further breaks, with the Dutchman double-faulting for the first then wildly miscuing with a backhand for the second.
Sinner was untroubled from then on, sealing a triumphant end to a spectacular season.
The Italian has only dropped one set throughout that streak, finishing a year that saw him win the Australian Open, US Open and ATP Finals with a 73-6 singles record.
Data Debrief: Sensational Sinner leads the way
This has been a truly remarkable year for Sinner, who has become the first man in the Open Era to win at least one set in every match throughout a season since Roger Federer in 2005.
His victory ensured Italy became the first team to retain the Davis Cup since the Czech Republic triumphed in 2012 and 2013.
Italy also captured the Billie Jean King Cup earlier this week, and they are just the third nation to claim both trophies in the same season in the last 30 years, after the Czech Republic in 2012 and Russia in 2021.
Sinner and Berrettini send defending champions Italy into Davis Cup final
Jannik Sinner's victory over Alex de Minaur clinched Italy's place in another Davis Cup final, with Matteo Berrettini also victorious as the defending champions beat Australia 2-0.
Italy won the Davis Cup for the first time since 1976 last year, and they will have an opportunity to defend their crown against the Netherlands on Sunday.
Former Wimbledon finalist Berrettini got the ball rolling with an entertaining 6-7 (6-8) 6-3 7-5 victory over Thanasi Kokkinakis, not surrendering a break after losing the opener in a tie-break.
That teed up Sinner to close out Italy's victory, with the world number one overcoming De Minaur 6-3 6-4, the same scoreline he beat the Australian by at the ATP Finals earlier this month.
Speaking after his victory in Malaga, Sinner said: "It means a lot. It was a tough encounter, playing Alex. We know each other quite well now, so I have to be very careful every time.
"It's a very tough challenge for me, so I was looking forward to this one. Obviously, it helped a lot that Matteo won the singles today. He played amazing tennis. It was very high quality.
"Hopefully, this can give us some confidence for [Sunday]. It's going to be a very difficult and tough day for us and also the Netherlands."
Data Debrief: Back-to-back for Italy
Italy's men are looking to follow in the footsteps of their female counterparts, who won the Billie Jean King Cup earlier this week.
They are just the third nation in history to make back-to-back finals at both the Davis Cup and the Federation/Billie Jean King Cup, after the United States (1963-64, 1978-79, 1981-82 and 1990-91) and Australia (1963-64 and 1964-65).
Djokovic appoints Murray as coach for Australian Open
Novak Djokovic has announced his long-term former rival Andy Murray as his coach for the Australian Open in 2025.
Murray, a three-time Grand Slam winner, announced his retirement earlier this year and played his final match at the Paris Olympics in August.
He will join Djokovic's team in the off-season and coach him through the opening grand slam of the year, which begins on January 12.
This will be Murray's first coaching role since retiring following a 19-year career.
"We played each other since we were boys. 25 years of being rivals, of pushing each other beyond our limits," Djokovic said in a video on social media.
"We had some of the most epic battles in our sport. They called us game changers, risk-takers, history makers.
"I thought our story may be over - turns out it has one final chapter.
"It's time for one of my toughest opponents to step into my corner. Welcome onboard coach, Andy Murray."
Djokovic failed to win a major title for the first time since 2017, though he did clinch a long-awaited Olympic gold medal in Paris.
The Serb is currently level with Margaret Court for the most major singles titles by any player. He has a good record in Australia though, winning 10 times in Melbourne, beating Murray in four of those finals.
Murray, who beat Djokovic to win the US Open title in 2012 and Wimbledon the following year, says he hopes they can achieve success together.
"I'm going to be joining Novak's team in the off-season, helping him to prepare for the Australian Open," Murray said.
"I'm really excited for it and looking forward to spending time on the same side of the net as Novak for a change, helping him to achieve his goals."
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