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.
'We have exhausted all options for reform through dialogue, and the governing bodies have left us no choice but to seek accountability through the courts.'
A razor-sharp Roger Federer got back to winning ways at the ATP World Tour Finals with a 6-4, 6-3 defeat of Frenchman Richard Gasquet on Thursday to keep his last-four chances alive.
He also overtook his career-best 65-season win tally of 2023 with this win.
World No 1 Novak Djokovic ended Kei Nishikori's impressive debut at the ATP World Tour Finals with a 6-1, 3-6, 6-0 semi-final victory at the O2 Arena on Saturday.
While Jannik Sinner and French Open champion Carlos Alcaraz have won the last seven major titles between them, the Italian cautioned against complacency and pointed to the strength of competition in the ATP Tour.
Rohan Bopanna and his doubles partner Florin Mergea qualified for the year-end ATP World Tour Finale when Vasek Pospisil and Jack Sock lost the Paris Masters final, on Sunday.
Jannik Sinner beat defending champion and Spanish second seed Carlos Alcaraz to win his first Wimbledon title.
World number one Rafael Nadal will face compatriot David Ferrer at next week's ATP World Tour Finals in London, with last year's champion Novak Djokovic and runner-up Roger Federer drawn in the second group on Saturday.
Stanislas Wawrinka returned to form with a 6-1, 6-1 thrashing of Tomas Berdych at the ATP World Tour Finals on Monday.
Jeevan Nedunchezhiyan and his partner Vijay Sundar Prashanth clinched their maiden ATP title together, winning the Hangzhou Open men's doubles event, while Yuki Bhambri and his French partner Albano Olivetti finished runners-up at the Chengdu 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.
Yuki Bhambri claimed his maiden ATP title as he along with South Africa's Lloyd Harris of South Africa won the doubles title in the ATP tennis tournament in Mallorca
But the big question that keeps striking the mind is, if Indian tennis system can actually claim this win as its own. The answer is: partially.
World No 1 Rafael Nadal is confident that arch-rival Roger Federer will be able to accumulate the points needed over the next few weeks to seal his spot for the season-ending ATP finale in London.
Andy Murray is within one match of securing his place in the ATP World Tour Finals after easing past local favourite Julien Benneteau 6-3, 6-4 on Wednesday to advance to the third round of the Paris Masters.
Maria Sharapova was officially inducted into the International Tennis Hall of Fame on Saturday night in Newport
Taylor Fritz moved closer to the semis of the season-ending ATP Finals after the American beat Alex de Minaur 5-7 6-4 6-3 in their last group game on Thursday, but he will have to wait and see if Jannik Sinner can take a set off Daniil Medvedev.
France's Boisson wins first WTA title in Hamburg
Nikolay Davydenko beat weary Argentine Juan Martin del Potro 6-3, 6-4 to claim the ATP World Tour Finals title at the O2 Arena on Sunday. The wiry Russian, who has climbed to sixth in the world this week, produced a faultless display to claim the biggest title of his career and a $1.5 million cheque.
Jannik and Carlos are the favourites at Flushing Meadows, but don't write these men off!
Rafael Nadal produced one of his best performances of the year to beat Andy Murray 6-4, 6-1 at the ATP World Tour Finals and move within sight of the semi-finals on Wednesday.
Jannik Sinner became the first Italian to win the ATP Finals title following a dominant 6-4, 6-4 victory over American Taylor Fritz.
Marin Cilic's debut appearance at the ATP World Tour Finals is fast turning into a nightmare after his second consecutive drubbing at the O2 Arena on Wednesday.
Top seed and defending champion Jannik Sinner, playing on his 24th birthday, ended French qualifier Terence Atmane's dream run at the Cincinnati Open with a 7-6(4), 6-2 win on Saturday to reach the final of the US Open tune-up event.
Carlos Alcaraz heads to the US Open in his now-familiar role as chief challenger to defending champion Jannik Sinner and the Spaniard will be driven this year by the twin pursuit of Grand Slam glory and the World No. 1 ranking.
Andy Murray avoided a 'double bagel' humiliation by Roger Federer at the ATP Tour finals on Thursday but conceded that even if he had played well he would not have lived with the "exceptional" brilliance of the Swiss.
However, the 33-year-old Spaniard will not know until later on Friday whether his Herculean effort was in vain.
The tournament's once-robust pool of around 300 line judges has been cut to 80 and they will serve as "match assistants", who support chair umpires and step in should the ELC -- powered by more than 450 cameras -- fail in any of the 18 courts in use.
Novak Djokovic moved to the brink of his 100th tour-level title after recovering from a second-set blip to beat British qualifier Cameron Norrie 6-4, 6-7(6), 6-1 in the Geneva Open semi-finals on Friday.
Six-time champion Novak Djokovic has withdrawn from this year's Italian Open, organisers said on Tuesday.
The immaculate Serb became the first player in the Tour Finals' 46-year history to claim the title four times in a row
Alexander Zverev rallied from a set down to beat defending champion Alexei Popyrin in Toronto and move into the semi-finals.
Alex De Minaur rallied from a set down and saved three match points to claim the Washington Open title after beating Alejandro Davidovich Fokina in the final of the ATP 500 event.
Britain's Andy Murray joined world number one Novak Djokovic and newly-crowned US Open champion Rafa Nadal as definite qualifiers for the ATP World Tour finals on Tuesday, but Roger Federer faces an uphill task to make the eight-man field.
Zverev and Shelton tested each other in a high-quality encounter before the world number three played a near flawless tiebreak to clinch the match in little over two hours and stretch his career win-loss record over the American to 3-0.
The opening match in the Pete Sampras Group produced a feast of stylish backhands from both players but it was Dimitrov, the first Bulgarian to qualify for the tournament in its 48-year-old history, who overcome some late jitters to prevail.
French Open champion Stan Wawrinka has become the fourth player to qualify for the season-ending ATP World Tour Finals in London.
Novak Djokovic battled from a set down to clinch his 100th tour-level title by beating Polish sixth seed Hubert Hurkacz 5-7, 7-6(2), 7-6(2) at the Geneva Open on Saturday.
Tallon Griekspoor prevailed in a high-voltage three-set final against Benjamin Bonzi to win his maiden ATP World Tour title.