Iga Swiatek has confirmed Wim Fissette as her new coach as she continues to prepare for next month's WTA Finals in Riyadh.
Swiatek parted ways with Tomasz Wiktorowski earlier this month after three successful years with the Pole, which included four grand slam titles.
Fissette has previously coached five world number one players.
The 44-year-old had stints with Kim Clijsters, Simona Halep, Victoria Azarenka, Angelique Kerber and, most recently, Naomi Osaka.
Fissette has coached Osaka in two matches against Swiatek, with the Japanese losing in the 2022 Miami final and in the second round at Roland-Garros earlier this year.
"I'm happy to announce that Wim Fissette is joining our team," Swiatek posted on social media.
"As you know, I'm preparing for the WTA Finals but my perspective is, as always, long-term, not short-term.
"I said many times that my career is a marathon for me, not a sprint and I'm working, operating and making decisions with this approach.
"I want to say that I'm very excited and looking forward to working with Wim. He seems to have a great attitude, vision and huge experience at a very top level of tennis.
"It's always crucial to try and get to know each other better but we're off to a good start and I can't wait to compete soon."
Swiatek has not competed since her quarter-final loss to Jessica Pegula at the US Open, pulling out of the China Open, where she was defending champion, due to "personal reasons".
She now faces a battle to remain at the summit of the WTA rankings, having seen Aryna Sabalenka close the gap following her successes at the US and Wuhan Open.
Raducanu helps Great Britain reach Billie Jean King Cup semi-finals
Emma Raducanu set Great Britain on their way to the Billie Jean King Cup semi-finals, as they knocked out defending champions Canada on Sunday.
Great Britain won both of their singles matches in Malaga, with Raducanu starting the day with a straight-sets victory.
She cruised through the first set before showing her mettle in the second to gain a 6-0 7-5 victory over Rebecca Marino in the early game.
Katie Boulter then secured their passage, holding off Leylah Fernandez 6-2 6-4 in one hour and 42 minutes, without the need for a doubles decider.
Despite being the second lowest-ranked team, Great Britain are through to the final four without dropping a set in any of their singles matches so far.
They will face Slovakia, who beat 2022 runners-up Australia earlier on Sunday to reach the semi-finals for the first time since 2013.
Like Great Britain, they triumphed in both of their singles matches, with Viktoria Hruncakova and Rebecca Sramkova coming out on top to secure the unassailable lead.
ATP Finals: Sinner 'surprised' himself with 2024 success
Jannik Sinner says he has surprised himself in 2024 after capping off his incredible year with a maiden ATP Finals title on Sunday.
Sinner beat Taylor Fritz in straight sets in Turin to claim his eighth title of the season and become the first Italian champion in the competition.
He is the seventh player in the Open Era to win the ATP Finals on home soil, and the first since Andy Murray in 2016, as he collected his Tour-leading 70th win of the campaign.
The 23-year-old, who had already confirmed his year-end number-one ranking in October, was delighted to finish the season on a high.
"It's amazing, it's my first title in Italy, and it means so much to me," said Sinner. "It's something very special.
"I just tried to understand what works best for each opponent, trying to play my best possible tennis. That was the key.
"It was a very high-level tournament from my side. At times, I couldn't have played better, so I am very happy."
Speaking to Sky Sports shortly after, he added: "Honestly, I have surprised myself the whole year at times, but in my mind, I know how much work I put in and how many sacrifices I have made to be in this position.
"I just try to play in the present moment."
Fritz, the first American to reach the final of the ATP Finals and US Open in the same season since Andre Agassi in 1999, will go into 2025 as the world number four.
The 27-year-old, who also lost to Sinner in the US Open showpiece, remained upbeat despite his defeat, revelling in his success over the past 12 months instead.
"It's been a really good week for me. Obviously, it's a good way to end the year. It gives me a lot of confidence finishing the season like this," Fritz said.
"Something I told my team in 2023 when I hit world number five for a week right before I was defending the Indian Wells title, was 'That's crazy, I'm five in the world, look at all these guys ranked behind me that are probably better than me'.
"Back then I was five, but I didn't feel like I was five. Now I'm ranked where I'm at. I feel like I belong.
"It's a different feeling. It's been a great year. That gives me a lot of confidence to have that belief. That's a huge part of having the big results. The goal I set for myself at the start of the year was to finish top five."
ATP Finals: Sinner completes sensational year with Turin triumph
Jannik Sinner claimed his maiden ATP Finals title as the all-conquering world number one capped off a sensational season in style.
Sinner defeated Taylor Fritz 6-4 6-4 in Turin on Sunday, claiming his eighth title of 2024 in the process.
It was a rematch of this year's US Open final, which Sinner also won, and the Italian made home advantage count in another dominant show of force befitting of his place at the top of the ATP rankings.
Fritz, the first American to reach the final of the ATP Finals and the US Open in the same season since Andre Agassi in 1999, managed to force only one break point, and even that was clawed back by Sinner at the end of the first set.
And Sinner's performance on serve was ultimately just too strong for Fritz, who was on the end of a wonderful drop-shot in the final game as his opponent delighted the crowd.
A cross-court forehand went long from Fritz on the next point to decide the match, and complete Sinner's supreme season.
Data Debrief: King of the hill
Sinner is the seventh player in the Open Era to win the ATP Finals on home soil, and the first since Andy Murray in 2016, as he collected his Tour-leading 70th win of the season. He is the first Italian champion of this competition.
The 23-year-old has also joined Roger Federer and Novak Djokovic as the only men to win the Australian Open, US Open and ATP Finals in the same year.
Having fallen at the final hurdle against Djokovic last season, Sinner was in no mood for a repeat of that heartbreak. Indeed, he went through the entirety of this year's tournament without dropping a single set, making him the first player to win the ATP Finals without giving up a set since Ivan Lendl in 1986.
Since the start of August, Sinner has won three of the four tournaments he has competed in, with his sole defeat coming to Carlos Alcaraz in the final of the China Open.
While 2024 will go down as Sinner's year, Fritz can at least take solace in a fine season of his own, and he will head into 2025 as the world number four.
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