The 21-year-old stuttered on the penultimate barrier but surged down the home stretch to power across the line and beat her previous record of 51.90 set at the U.S. trials in June.
A summary of Friday's tennis action from around the world.
Romanian fifth seed Simona Halep advanced to the third round of the U.S. Open with a 6-3 6-4 win over Lucie Safarova on Thursday in the first full match played under a closed roof at Arthur Ashe Stadium. The $150 million retractable roof was installed ahead of this year's tournament and guaranteed there would be at least some action on a muggy and overcast Day Four at the year's final grand slam.
The country will host the first ever live NBA match in October this year
The Sikh community, which was already concerned over the spate of hate attacks on individual Sikhs like taxi drivers, gas station attendants etc since 9/11, will be even more concerned over this attack on a congregation of Sikhs in a gurudwara, says B Raman
The Islamic State is preparing to attack India to provoke an Armageddon-like confrontation with the United States, according to an internal recruitment document of the feared group which also seeks to unite the Pakistani and Afghan Taliban into a single army of terror.
Some Croatians wept with sadness while others felt pride that their tiny nation had gone so far in the tournament.
Former World No 1 Maria Sharapova is expected to face a disciplinary hearing over a drug violation in June.
Croatia's Football Federation (HNS) sacked Ognjen Vukojevic, a member of the national team's coaching staff, over a "glory to Ukraine" video posted after Croatia beat Russia in the World Cup quarter-finals, HNS said in a statement on Monday.
The first seven picks of the draft entered as college freshman and 18-year-old Frenchman Frank Ntilikina was taken by the New York Knicks with the eighth choice.
Marin Cilic has split with coach Goran Ivanisevic after three years, the world number 12 said.
'I know earlier in the tournament I said something in kind of a bad way and now I'm saying it in a good way: That it's because of your energy that I'm in the final'
Christian Pulisic scored his 10th goal for the United States before being substituted after picking up a knock in a 1-1 draw with Chile in a friendly in Houston on Tuesday.
US Open champion Stephens again ended former world number one Victoria Azarenka's hopes of a fairytale comeback by beating her 3-6, 6-2, 6-1 in an afternoon encounter, while French Open champion Ostapenko beat unseeded American Danielle Collins in the nightcap, staving off a set point en route to a 7-6(1), 6-3 triumph.
Man of many faces, Medvedev now a Grand Slam finalist
Four years ago Berrettini was playing a Futures event in Italy and on Wednesday became the first Italian man since Corrado Barazzutti 42 years ago to reach the US Open semi-finals.
With last year's French Open, her first Grand Slam title, under her belt, Simona Halep decided that 2019 would be "a chill year". Then, on Saturday, she stepped on to Wimbledon's Centre Court and obliterated the great Serena Williams 6-2, 6-2 in 56 minutes to win the final.
Floyd Mayweather Jr. preserved his unbeaten record as a professional with a unanimous decision victory over Manny Pacquiao of the Philippines in their welterweight mega bout at theMGM Grand Garden Arena on Saturday.
"Regrettably, I've decided not to participate in the French Open," Federer said on his Facebook page on Monday.
Awesome images from the world of Sport 2018.
As the fans head toward Flushing Meadows, tennis stars gear up with ground-breaking styles to rule the courts.
Azarenka punished her Russian opponent's weak serve to wrap up the final in 80 minutes in relentless humidity under a searing sun in the early afternoon encounter on the Key Biscayne hardcourt.
'I don't mind when he misbehaves. Obviously, I don't like the bad language. It's just when he doesn't try to play tennis, when he doesn't try to win then I think the umpire needs to step in. I think in this situation, default him on the spot, rather than suspend him'
The 39-year-old former world number one and 14-times major champion, who has not played since pulling out of the Farmer's Open in early February due to back problems, has slipped to 104th in the rankings.
Pierre-Hugues Herbert and Nicolas Mahut became the first all-French duo to win the U.S. Open men's doubles title after easing past Britain's Jamie Murray and Australian John Peers 6-4, 6-4 on Saturday.
The 2020 race marks Biden's third attempt at running for US president. He first tried in 1988 but dropped out after allegations of plagiarism. He ended his second attempt in 2008 after garnering less than one per cent in the crucial Iowa caucuses.
Kobe Bryant, one of the NBA's all-time greatest players whose international stardom transcended basketball, was killed at age 41 on Sunday in a helicopter crash near Los Angeles along with his 13-year-old daughter and seven others on board, officials said.
Tournament officials said there was no heat rule in effect on Friday for the first time in three days, with cloud cover expected to bring cooler temperatures.
Muchova, who came into the match against the 12th seed with a world ranking of 202, was understandably nervous from the outset but grew into the contest and eventually prevailed 3-6, 6-4, 6-4 in two hours and 27 minutes.
'When you don't have that confidence to play three, four hours with a good backhand against Rafa, is just matter of time to get down your game'
Images from Day 6 of Wimbledon at the All England Lawn Tennis and Croquet Club in London, on Saturday.
The new crop of young players are poised for a Grand Slam breakthrough and New York's bright lights could provide the inspiration that finally gets one of them over the top, five-times US Open champion Roger Federer said on Friday.
Johnson to meet Medvedev in Winston-Salem final
Mercedes's Valtteri Bottas snatched pole position for the US Grand Prix on Saturday, breathing life into his remote title hopes while signalling to Lewis Hamilton he will not be gifting a sixth drivers' crown to his team mate.
These upcoming phones might have the coolest tech of 2018.
Nick Kyrgios ended Novak Djokovic's 19-match winning run at Indian Wells by beating the Serb 6-4, 7-6(3) to reach the BNP Paribas Open quarter-finals in Indian Wells on Wednesday, while Roger Federer also advanced with a straight sets win over Rafael Nadal.
ATP chief hails Nadal's 'unprecedented' return to top
Lucas Pouille was not prepared to say his pulsating four hour, fourth-round upset of 14-time grand slam winner Rafael Nadal at the US Open on Sunday was a career changing moment.
As far as Halep was concerned, her 6-1, 6-3 semi-final win over Elina Svitolina meant that her mother Tania will finally get to experience something she has been dreaming of for more than a decade.
Eintracht Frankfurt changed their team shirt to display "#blacklivesmatter" on the front for their German Cup semi-final at Bayern Munich on Wednesday to take a stand against racism, the club said. Athletes across the world have joined in support of protests triggered by the death of unarmed black man George Floyd in US police custody last month.
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