Jannik Sinner brushed aside heat concerns to reach the Australian Open quarter-finals, while Iga Swiatek ended home hopes by overpowering Maddison Inglis in Melbourne.
Factbox on Carlos Alcaraz, who beat Serbian fourth seed Novak Djokovic to win his first Australian Open title on Sunday, increasing his overall Grand Slam tally to seven.
The event comes at a time when tennis is facing criticism over its relentless tour schedule.
Norway's Casper Ruud, the French Open runner-up in 2022 and 2023, crashed out of the tournament in the second round on Wednesday after losing 2-6, 6-4, 6-1, 6-0 to unseeded Nuno Borges of Portugal.
Italians Sara Errani and Andrea Vavassori retained their mixed doubles title at the US Open on Wednesday, overcoming Iga Swiatek and Casper Ruud in the final.
As the spotlight shines on Carlos Alcaraz's title defence and Novak Djokovic's pursuit of a record 25th Grand Slam, a determined group of challengers is quietly preparing to shake up the draw.
Norway's Casper Ruud won his first Masters 1000 title on Sunday, as he stormed to a 7-5, 3-6, 6-4 victory over fifth seed Jack Draper in the Madrid Open final with a gutsy performance that showcased his clay-court mettle.
Rangy 19-year-old Mensik, the 2022 boy's singles finalist at Melbourne Park, sealed the match in style with a searing forehand winner to push the three-times Grand Slam finalist and sixth seed to the exit.
He also overtook his career-best 65-season win tally of 2023 with this win.
Ruud criticises ATP rankings 'rat race'
'We heard it was like the Hollywood of mixed doubles.'
Iga Swiatek captured her first Cincinnati Open title on Monday by beating Jasmine Paolini in straight sets.
World number two Gauff clawed her way back from a set down to defeat Russian Veronika Kudermetova 4-6, 7-5, 6-2 in a match that stretched over two and a half hours.
Michelsen, seeded 26th, will face hard-hitting 11th seed Karen Khachanov of Russia, who upset eighth seed Casper Ruud in their fourth round match 6-4, 7-5.
Norwegian Casper Ruud did not let a rib injury get in the way of setting up a Madrid Open final showdown with fifth seed Jack Draper as he reached the title match without dropping a set following a 6-4 7-5 win over Francisco Cerundolo on Friday.
The Dane revealed he had taken notes from how Novak Djokovic beat Alcaraz in the Olympic final at Roland Garros.
Factbox on Spanish second seed Carlos Alcaraz, who beat Italian world number one Jannik Sinner 4-6, 6-7(4), 6-4, 7-6(3), 7-6(10-2) in the French Open final on Sunday to win his fifth Grand Slam title.
Carlos Alcaraz demolished Mattia Bellucci to banish memories of last year's shock early exit at the US Open on Wednesday.
Tenth seed Lorenzo Musetti rallied from a set down to beat Frenchman Giovanni Mpetshi Perricard in the first round of the US Open on Tuesday even as Carlos Alcaraz mauled big-serving American Reilly Opelka and veteran Venus Williams made an emotional exit.
Nine of the world's top-10 men and nine of the top-10 women have officially entered into the U.S. Open's revamped mixed doubles event, tournament organisers said on Tuesday, with former singles champions Carlos Alcaraz and Emma Raducanu teaming up.
An off-colour Alcaraz lost 6-1, 7-5 to Norway's Casper Ruud in his opening match on Monday and the 21-year-old cancelled a public training session the following day.
Alexander Zverev will be third seed for the French Open but the 28-year-old German's prospects of winning his first Grand Slam title in Paris are not looking especially bright.
Carlos Alcaraz suffered a shock 6-1, 7-5 defeat against Norway's Casper Ruud in his opening match at the ATP Finals
Defending ATP Finals champion Novak Djokovic has pulled out of the season-ending event in Turin through injury, the Serbian said on Tuesday.
Four-times Grand Slam champion Alcaraz, who is gearing up to defend the French Open title later this month, fired off 24 winners in a strong performance to seal victory.
Defending champions Iga Swiatek and Carlos Alcaraz powered into the second round of the French Open on Monday.
Alexander Zverev cruised past Frenchman Lucas Pouille in straight sets in the first round of the Australian Open on Sunday.
The Dutchman collapsed on the court after converting his sixth match-point to end an absorbing three hour, seven minute affair under sunny skies on Stadium One court.
World number two Carlos Alcaraz beat seventh seed Arthur Fils 6-2, 6-4 on Saturday to advance into his third Barcelona Open final, where the Spaniard will face Denmark's Holger Rune for the title.
Coco Gauff dismantled defending champion Iga Swiatek 6-1, 6-1 on Thursday with a ruthless display to storm into her first Madrid Open final, where she will face world number one Aryna Sabalenka for the WTA 1000 title.
Zverev cruised past home favorite Roberto Bautista Agut 6-2, 6-2, while Sabalenka triumphed over qualifier Anna Blinkova 6-3, 6-4.
Eighth seed Machac, who won gold in mixed doubles at the Paris Olympics, became the third player from his country to win an ATP 500 title, following Tomas Berdych and Radek Stepanek.
No. 1 seed Carlos Alcaraz of Spain was pushed to three sets before finishing off Dutch wild card Botic van de Zandschulp in the first round of the ABN AMRO Open.
Jannik Sinner's stupendous year may have been clouded by an anti-doping controversy but on the court he is finishing the season like an express train and has won 25 of his last 26 matches.
Novak Djokovic won 12 of the last 14 games of his match against Lorenzo Musetti to crush the Italian 6-2, 6-2 and move into the quarter-finals of the Miami Open in his best performance since the Australian Open.
Top seed Carlos Alcaraz of Spain and No. 8 seed Hubert Hurkacz of Poland will clash in the ABN Amro Open semi-finals on Saturday after both posted victories on Friday in Rotterdam, Netherlands.
Taylor Fritz became the first American since 2006 to reach the title match at the ATP Finals after winning a slugfest against world number two Alexander Zverev in on Saturday.
Rafael Nadal teamed up with Norwegian Casper Ruud to register a 6-1, 6-4 win over second seeds Guido Andreozzi and Miguel Reyes-Varela on the Swedish clay.
Alex Michelsen hung on to defeat Tung-Lin Wu and help the United States take a 2-0 lead against Taiwan in the Davis Cup qualifier in Taipei City on Friday.