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.
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.
Surprise package Davidovich Fokina, who knocked out top-ranked Novak Djokovic and Indian Wells champion Taylor Fritz in the earlier rounds at Monaco, drew first blood by breaking Tsitsipas to take a 2-1 lead in the opening set.
Carlos Alcaraz stormed into his first Masters final in 13 months when he beat Alejandro Davidovich Fokina 7-6(2), 6-4 on Saturday.
Top seed Taylor Fritz of the United States was beaten by Spanish eighth seed Alejandro Davidovich Fokina in the quarter-finals.
Djokovic struggled to find his range early in the contest as Spaniard Davidovich Fokina raced to lead
Twice finalist Ruud overcomes Davidovich Fokina test
Novak Djokovic huffed and puffed but forced his way into the fourth round of the French Open.
The five-times Grand Slam champion recharged his batteries with a short trip to Ibiza but is back in harness ahead of his campaign at Queen's Club, where he faces countryman Alejandro Davidovich Fokina in his opener on Tuesday.
Third-ranked Carlos Alcaraz recorded a 7-5, 6-2 win over seventh-seeded Karen Khachanov of Russia to advance to the semifinals of the China Open on Monday in Beijing.
Defending champion Stefanos Tsitsipas showed no signs of fatigue following Friday's marathon battle as he eased past German Alexander Zverev 6-4, 6-2 to reach the Monte Carlo Masters final on Saturday.
IMAGES from Day 4 of the matches played at the Australian Open at Melbourne Park on Wednesday.
Spain's Rafa Nadal and Carlos Alcaraz will team up to play doubles at this year's Olympic Games in Paris, the Royal Spanish Tennis Federation (RFET) said on Wednesday.
Alexander Zverev is convinced there was a defect in the electronic line calling system during his Madrid Open win
India takes on the Netherlands in the Davis Cup Qualifier, relying on faster playing conditions and the return of Yuki Bhambri to overcome a depleted Dutch side.
Italian seventh seed Jannik Sinner beat Tommy Paul to set up a Canadian Open final clash with Australia's Alex De Minaur
Teenager Andreeva shows her mettle, Pegula advances at French Open
Anna Kalinskaya outclassed Britain's Emma Raducanu at the Washington Open on Saturday to advance to the final, where she will face Leylah Fernandez.
Carlos Alcaraz said he thought the trio of teenagers who have lit up the first week of the Australian Open have the skills to play the game at the top level
Shelton blasted an ace on match point to seal the win and avenge his five-set loss to Tiafoe at last year's U.S. Open as the 22-year-old continues to make strides in his breakout season.
Britain who topped Group B in the Davis Cup after their win over France on Sunday now face Serbia, as the draw for the Final 8 Knockout stage was announced on Tuesday. Serbia finished second behind Czech Republic, but clinched their place in the Final 8 with a win over Spain.
Carlos Alcaraz's US Open preparations suffered a setback on Friday as the world number one fell to American Tommy Paul
Iga Swiatek was the latest top player to suffer an upset loss in Montreal as the Wimbledon champion
A round-up of Friday's action in the Davis Cup.
The 43-year-old Bopanna and 35-year-old Ebden, who claimed two doubles titles on the ATP Tour earlier this year, will next face the unseeded British pair of Jacob Fearnley and Johannus Monday on Sunday.
Talk about a man in a hurry -- 10th seed Ben Shelton required just 55 seconds to finish off Australian Rinky Hijikata and reach the Wimbledon third round on Friday.
Medvedev tames claycourt demons to advance in Madrid.
Jannik and Carlos are the favourites at Flushing Meadows, but don't write these men off!
Former champion Daniil Medvedev beat Italy's Lorenzo Musetti 6-3 6-2 on Wednesday to reach the third round of the Cincinnati Open where Novak Djokovic was preparing to begin his U.S. Open preparations.
Zverev cruised past home favorite Roberto Bautista Agut 6-2, 6-2, while Sabalenka triumphed over qualifier Anna Blinkova 6-3, 6-4.
Novak Djokovic is returning to the US for the first time in two years after being denied entry due to being unvaccinated for COVID-19.
The Australian Open champion never faced a break point and used her hard and accurate serve to dispatch Gauff.
Djokovic raced into a 3-0 lead before his opponent found his rhythm to set up three break points at 4-2.
Novak Djokovic was stunned 7-6(4), 6-2 by Matteo Berrettini in the Qatar Open first round on Tuesday as the Italian enjoyed his first win over the former world number one.
World number one Novak Djokovic was furious with the chair umpire for not suspending play as rain trickled down during his Italian Open second-round match against American Taylor Fritz.
World No 8 Muchova withdraws from Aus Open with wrist injury
Carlos Alcaraz got his grasscourt campaign up and running with a 6-4, 7-6(4) victory over Australian Adam Walton
Alcaraz outlasts Hurkacz, Ruud stunned at Canadian Open
Third seed Andrey Rublev suffered a first round exit after his Qatar Open title, losing to qualifier Quentin Halys 3-6, 6-4, 7-6(5) at the Dubai Open on Tuesday.
Indian doubles pair of Yuki Bhambri and Saketh Myneni put up a valiant fight before going down to Alejandro Davidovich Fokina of Spain and Adrian Mannarino of France in a three-setter.