Sleepless nights. Constant thoughts of what went wrong — and how it could have been prevented.

Jannik Sinner opened up about his ongoing doping case after beating U.S. Open runner-up Taylor Fritz 6-4, 6-4 on Sunday for the ATP Finals trophy before his home fans in Turin, Italy.

Sinner tested positive in two separate drug tests in March and a decision to clear him of wrongdoing was appealed by the World Anti-Doping Agency in September. A final ruling is expected from the Court of Arbitration for Sport early next year.

Sinner’s explanation was that the banned performance-enhancer entered his system unintentionally through a massage from his physiotherapist, who had used a spray containing the steroid to treat his own cut finger.

“I’ve kept on thinking about where we went wrong and what we could have done better,” Sinner said in Italian. “I had days where I wasn’t feeling great; nights when I didn’t sleep well.

“But when I put my hat on, I don’t think about what’s going on beyond the court,” Sinner added. “I’m fortunate to have people around me who keep me stable. Thanks to them we’ve continued to work hard every day like there’s no tomorrow and we’ve even improved in this period.”

Sinner’s performance has approached domination lately.

Sinner’s victory in Turin was the latest big achievement in a year full of them following his first two Grand Slam titles at the Australian Open and U.S. Open and clinching the year-end No. 1 ranking.

Sinner has won 26 of his last 27 matches and ends the ATP season with eight titles and an overall record of 70-6.

“The work will never stop. We know we still have room for improvement,” Sinner said. “But it’s been an incredible season and there’s no better place to finish the season than here.”

Sinner maintained his recent mastery over Fritz, having also beaten the American in the U.S. Open final in September and in the group stage this week at the elite event for the year’s top eight players.

Britain kept alive its hopes of winning the Billie Jean King Cup for the first time by defeating defending champion Canada in the quarterfinals in Malaga, Spain. Katie Boulter clinched the 2-0 victory with a 6-2, 6-4 win over Leylah Fernandez after Emma Raducanu beat Rebecca Marino 6-0, 7-5 in the first singles match.

SOCCER

Barbra Banda scored the go-ahead goal and the Pride defeated the Kansas City Current 3-2 in Orlando, Fla., to advance to the National Women’s Soccer League championship game.

The Pride will face the Washington Spirit on Saturday for the league title at CPKC Stadium in Kansas City. The Spirit advanced to the final on a penalty shootout with a 1-1 draw against defending champions Gotham FC in the other semifinal, on Saturday.

Haley McCutcheon and the legendary Marta also scored for top-seeded Orlando, which lost just two games this season and won the NWSL Shield. The Pride didn’t lose at home all season.

The Pride advanced to the semifinals with a 4-1 win last weekend over the Chicago Red Stars, which was the Pride’s first playoff victory. Banda had two goals and Marta converted a penalty.

NWSL Golden Boot winner Temwa Chawinga scored the lone goal in the fourth-seeded Current’s 1-0 victory over the North Carolina Courage to advance to the semifinals.

Chawinga got through a practice for the Current Friday, but coach Vlatko Andonovski was uncertain how much she could play Sunday because of a knee issue. Chawinga, who had 20 goals this season, started and played the entire game.

Brazilian Debinha scored for the Current in the 33rd minute on Michelle Cooper’s cross.

Ally Watt dribbled around a defender before bursting forward and sending the ball to an open McCutcheon for the tying goal in the 41st minute.

Banda scored the go-ahead goal with a strike off a long pass from Kylie Strong in the 53rd. Banda, who played in the Olympics this summer for Zambia, had 13 regular-season goals.

Marta, a six-time FIFA World Player of the Year, maneuvered around a pair of defenders, then got past Kansas City keeper Almuth Schult, before scoring into an empty net in the 82nd.

Vanessa DiBernardo converted a penalty in stoppage time for the Current, who set the regular-season record for most goals with 57.

MIXED MARTIAL ARTS

Jon Jones sent Stipe Miocic into retirement with a back kick to the ribs and used a series of blows to the head in the third round to retain the UFC heavyweight championship in front of President-elect Donald Trump in the main event of UFC 309 at Madison Square Garden late Saturday night.

Widely considered the best fighter in the world, Jones (28-1-0; 1 NC) was the aggressor from the start and landed a series of shots to Miocic’s head in the first round.

British heavyweight Tom Aspinall looms as the next challenger for Jones. Aspinall won a fight for the interim heavyweight title last November in the Garden. UFC CEO Dana White had promised Aspinall would challenge the winner of the main event in a unification bout.

“As far as my future in the octagon, I decided that maybe I will not retire,” Jones said. “I know that we have options.

Miocic (20-5) failed in his bid to win the heavyweight crown for a third time and immediately announced his retirement.

“I’m done,” Miocic said. “I’m hanging ’em up.”

PRO FOOTBALL

Backup quarterback Nick Arbuckle led the Toronto Argonauts to their 19th Grey Cup title, throwing two second-half touchdowns passes in a 41-24 victory over the Winnipeg Blue Bombers at B.C. Place in Vancouver, British Columbia.

Forced into action after starter Chad Kelly broke his ankle in Toronto’s East championship victory over Montreal, Arbuckle completed 26 of 37 passes for 252 yards in Toronto’s second Grey Cup victory over Winnipeg in three seasons.

Toronto is 8-0 against Winnipeg in the Grey Cup, also winning in 1937, 1938, 1945, 1946, 1947, 1950 and 2022. Winnipeg was appearing in its fifth straight Grey Cup. It won consecutive titles in 2019 and 2021, with the 2000 season canceled.

WINTER SPORTS

Olympic champion Clement Noel dominated the first men’s World Cup slalom of the season in Levi, Finland, for his first win in 22 months.

The Frenchman protected his opening-run lead to beat Henrik Kristoffersen of Norway by 0.80 seconds. Swiss allrounder Loic Meillard placed third.

World champions Deanna Stellato-Dudek and Maxime Deschamps of Canada survived a fall to win the Finlandia Trophy pairs event and book their spot at the figure skating Grand Prix Final, while Britain’s Lilah Fear and Lewis Gibson won the ice dance in Helsinki.