The 2018 US Open Women's Singles final was the championship tennis match of the Women's Singles tournament at the 2018 US Open. It was contested between Serena Williams and Naomi Osaka, seeded 17th and 20th respectively. Osaka defeated Williams in straight sets, 6–2, 6–4, in one hour and 19 minutes.

The match was significant for both players. It was Williams's first US Open after a 12-month hiatus to give birth to her first child in September 2017, and second attempt since her pregnancy (after that year's Wimbledon) to equal Margaret Court's all-time record of 24 major titles. Osaka was the first Japanese player to contest a major women's singles final, and was attempting to become the first Japanese player, male or female, to win a major singles title.

The match generated significant controversy due to a series of altercations between Williams and chair umpire Carlos Ramos during the second set. Williams's on-court behavior and Ramos's disciplinary actions, and Williams's responses, particularly her invocation of perceived sexism during her arguments with Ramos and officials, and following the match, polarized the tennis community and media worldwide. The International Tennis Federation issued a statement supporting Carlos Ramos's umpiring during the match, stating that his "decisions were in accordance with the relevant rules and were re-affirmed by the US Open’s decision to fine Serena Williams for the three offences".

Background The pair met only once previously, with Osaka winning in straight sets in the first round of the 2018 Miami Open.

Williams At the start of the tournament, Williams had won 23 Grand Slam championships, the most in the Open Era, and second-most of all time, and was attempting to equal Margaret Court's all-time record of 24 Grand Slam championships, which required her to best her own record of being the oldest female Grand Slam women's singles champion at the time set at the 2017 Australian Open.

2018 marked a highly anticipated comeback for Williams since giving birth in September 2017. Her prior successes, and consequent status as one of the greatest tennis players of all time, attracted significant media interest in her pregnancy and motherhood, where she openly revealed almost suffering near-fatal childbirth-related complications as a result of an emergency Caesarian section, requiring five surgeries and leaving her bedridden for six weeks. She used her struggle to cast light on the issue, consequently being hailed as an inspiration for mothers overall, further adding to public anticipation towards her return to tour.

Williams's return was, however, difficult. Originally intending to return for the 2018 Australian Open, complications from her pregnancy caused her to miss the tournament, leaving her unable to defend her title from the previous year, and delay her return until the Indian Wells Masters that February, where she lost to older sister Venus in the third round. In the Miami Open two weeks later, Williams would face Osaka for the first time, and only time until their US Open match, in the first round, where Osaka upset Williams in straight sets - Williams's earliest ever exit from the Miami Open in her career. Williams's first Grand Slam campaign since her return at the French Open ended disappointingly, as she withdrew before her fourth round match against Maria Sharapova. However, her Wimbledon campaign the following month was more successful, reaching the final. Despite losing to Angelique Kerber in straight sets, her feat of reaching the final in the first place was seen as both a return to form—Sonia Oxley of BBC Sport quipping that "she still has the stamina, spirit and shots to carry on collecting Grand Slam titles", and 2016 men's singles champion Andy Murray noting that "It is tough to bet against her now she's got this far"—and a reinforcement of her status as an icon of motherhood and women's empowerment.

Osaka

Osaka was relatively unknown, beginning the year ranked No. 68, having only entered the top 50 briefly in 2016, and having neither been seeded in the main draw of a Grand Slam tournament nor advanced beyond the third round. She had, however, made a break at the 2017 US Open, upsetting defending champion Angelique Kerber in the first round, 6–3, 6–1. She improved upon her Grand Slam record at the 2018 Australian Open, advancing to the fourth round where she lost to world No. 1 and eventual runner-up Simona Halep in straight sets, 6–3, 6–2.

Following her 2018 Australian Open campaign, Osaka earned the biggest win of her career at Indian Wells, during which she defeated former World No. 1s Maria Sharapova and Karolína Plíšková, and avenged her Australian Open loss to Halep in the semifinal, before defeating Daria Kasatkina in the final to claim her biggest championship yet. Subsequently, she entered the 2018 French Open seeded 21st, the first Grand Slam tournament in which she was seeded in the main draw. By mid-August 2018, Osaka attained the highest ranking yet of her career at World No. 17, and was the youngest player in the WTA's top 20.

Osaka entered the main draw of the US Open seeded 20th; however, early round losses on her side of the draw, including those of Australian Open champion Caroline Wozniacki and former Wimbledon champion Petra Kvitová, meant that Osaka did not face any player seeded above her until her semifinal with Madison Keys. Osaka qualified for the final having only dropped one set during the entire tournament (in the fourth round against Aryna Sabalenka), and by beating Keys in the semifinal 6–2, 6–4, a match during which she saved all 13 break points she faced. Osaka was the first player from Japan to contest a Grand Slam women's singles final (the second Japanese able-bodied player overall after Kei Nishikori at the 2014 US Open, and fourth player overall after Nishikori, Yui Kamiji and Shingo Kunieda), and was attempting to become the first able-bodied Japanese player, male or female, to win a Grand Slam singles title.

Osaka's personal admiration for Williams as a primary inspiration for her tennis career was a focal point of the media's interest in her rise. Upon defeating Maria Sharapova in her successful 2018 Indian Wells campaign, Osaka quipped, "There are three people I wanted to play, Venus, [Sharapova] and Serena. Now I'm just waiting to play Serena." Williams has been described as Osaka's "hero" and "idol", and the US Open final matchup as Osaka's childhood dream; Osaka's focus has been described as "solely on becoming the next Serena", Osaka herself remarking that, during challenging scenarios on court, she thinks "What would Serena do?" Interviewed following her semi-final victory over Keys, Osaka commented on her thoughts during the match, "I was just thinking that I really wanted to play Serena, because she is Serena", and when asked what her message to Serena would be, simply said, "I love you."

Match

The match began at 4:20 p.m. Eastern Time. Carlos Ramos of Portugal was the chair umpire for the match.

Sets The first set passed by without any major incident, with Osaka breaking twice en route to winning it 6–2.

With Williams leading the second set, 1–0, 15-40, chair umpire Ramos gave Williams an official warning for coaching, a code violation under International Tennis Federation rules. Television replays showed her coach, Patrick Mouratoglou, gesturing to Serena with his hands and nodding, apparently signalling her to move forward toward the net. Mouratoglou admitted after the match that he did signal some form of coaching from the players' box, but of which he believed Williams was unaware. In response, Williams approached Ramos and told him, "If he's giving me a thumbs up, he's telling me to come on. We don't have any code, and I know you don't know that, and I understand why you thought that was coaching but I'm telling you it's not. I don't cheat to win. I'd rather lose. I'm just letting you know." Osaka won the next point to level the second set, 1–1. During the following court change, leading 2-1, Williams brought up the matter again with Ramos, saying "it's not something I would do but I could understand why you may have thought that but just know I've never cheated." Ramos assured Williams that he understood her, the on-court microphone picking him up telling Williams "I understood your reaction as well", which Williams thanked him for; however, the ruling was upheld and the penalty was not retracted.Naomi Osaka captures US Open; Serena Williams fined, penalized game for calling chair umpire 'a thief' ESPN

After breaking Osaka's serve for the first time in the match, Williams was serving at 3–1, at 30-15, however double faulted two points in a row to bring up break point, 30-40. Osaka broke back Williams's serve on the next point to bring the set back on serve, 3–2, as Williams hit the ball into the net on a backhand unforced error, turned to her box in frustration saying (according to on-court commentator Luke Jensen) "I can't get over the top of the ball", and smashed her racket on the court. Ramos issued her a second code violation, this time for racket abuse. As her second violation, she was penalized a point, and thus the next game started 15-0 to Osaka's advantage. Upon hearing of this, Williams raised the issue of her first code violation again with Ramos, insisting "this is unbelievable. Every time I play here I have problems." Williams said to Ramos that "make an announcement that I didn't get coaching ... you owe me an apology, I have never cheated in my life!" Invoking her recent pregnancy, she further remonstrated that "I have a daughter and I stand for what is right for her" and that "you will never do another one of my matches." Despite the disruption, Osaka kept her concentration and held serve the following game to level the set at 3–3, before breaking Williams's serve a second time in the set with a forehand winner to lead 4–3.

At the following change of ends, Williams continued to berate Ramos, accusing him of attacking her character by insinuating that she cheated via being coached. She continued to demand an apology from Ramos, commanding, "you owe me an apology. Say it! Say you're sorry!" and asserting to him that "you will never, ever, ever, be on another court of mine as long as you live."Five things we learned from "Serena vs. the Umpire" - Tennis.com The exchange culminated in Williams calling the umpire a "liar" and a "thief". Ramos judged this to be a further code violation for verbal abuse; as the third code violation of the match against Williams, Osaka was awarded the next game by default, bringing the score to 5–3 and Osaka one game away from victory.Serena Williams unleashes furious rant at umpire as she loses US Open 2018 final to Naomi Osaka – The Telegraph Williams then demanded to speak to tournament referee Brian Earley and WTA supervisor Donna Kelso, to whom Williams indignantly claimed that such incidents have "happened to me too many times", she was being unfairly penalized because she was a woman, and that male players "do a lot worse" without penalty, and that "it happened to me at this tournament every single year" (Williams had previously been subject to code violations three times in over twenty tournaments here, all of which were upheld). Following this exchange, Williams held her serve to love (at 5–4), and continued to remonstrate with Kelso after the game. Osaka, however, held serve in the following game to win the set 6–4 and the match.Highlights US Open 2018 Women's final: Naomi Osaka beats Serena Williams to win first Grand Slam championship – FirstpostWilliams rebukes chair umpire; Osaka wins US Open final – PBS NewshourAt U.S. Open, power of Serena Williams and Naomi Osaka is overshadowed by an umpire’s power play – Washington Post

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