Jack Draper crashes out of Miami Open after loss to Reilly Opelka, while Ethan Quinn stuns Casper Ruud in a breakthrough win.
Jannik Sinner defeated Rafael Jodar in the Madrid Open quarter-finals, securing his spot in the semi-finals and becoming the sixth player to reach the semi-finals of all nine ATP 1000 Masters tournaments.
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.
With world number four Ruud already assured of a semi-final berth the match was in reality a dead rubber.
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.
Photos from the ATP World Tour Finals matches played in London on Monday
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.
Six-time champion Roger Federer survived a late-night Swiss semi-final thriller against Stanislas Wawrinka on Saturday to set up an ATP World Tour Finals showdown against Novak Djokovic.
Carlos Alcaraz beat his great rival Jannik Sinner 7-5, 7-6(8) to win their Hyundai Card Super Match exhibition event in Incheon, South Korea, on Saturday that marked the start of the season for the world's top two men's tennis players.
The 26-year-old has not always handled the expectations placed on his shoulders after he won the Wimbledon junior title in 2008 with a game style uncannily like Federer's.
Roger Federer ended Grigor Dimitrov's seven-match winning streak and showed the Bulgarian he has some way to go to live up to his 'Baby Federer' tag with a 6-3 7-6 (2) quarter-final victory at the Basel Open on Friday.
World number eight Mirra Andreeva warmed up for the Australian Open with a comfortable 6-3, 6-1 victory over fellow teenager Victoria Mboko in the Adelaide International final on Saturday to claim her fourth WTA Tour title.
Dhakshineswar Suresh capped a breakthrough Davis Cup performance by clinching the decisive fifth rubber to hand India a memorable 3-2 win over the Netherlands and seal the country's place in the Qualifiers Round 2.
Dominic Thiem stayed very much in the mix at the ATP World Tour Finals with a 6-3, 1-6, 6-4 victory over mercurial Frenchman Gael Monfils at the O2 Arena on Tuesday.
Dhakshineswar Suresh is the nation's new Davis Cup hero, having led India to a historic 3-2 Davis Cup win over The Netherlands on Sunday.
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.
Nagal's ranking nosedives to 233, still-strong Bopanna out of top-50 for first time in 15 years
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.
Novak Djokovic's tremendous run of form since the start of the year means the Serb has already booked his spot at the ATP World Tour finals in London.
While off-court battles over pay and governance rumbled on, opportunities were scarce beyond the duopoly at the top of the men's game, leaving Djokovic to provide the year's standout moments for the chasing pack.
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
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.
Novak Djokovic slides, stretches and dominates to reach the Australian Open third round and move within one win of 400 Grand Slam victories.
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.
Kyrgios beats Sabalenka in 'Battle of the Sexes' showdown
Carlos Alcaraz has defended his decision to play in the lucrative Six Kings Slam exhibition event in Saudi Arabia
With 1,500 points available for an undefeated champion next week, the tournament could produce a thrilling climax with Murray and Djokovic, who have never met at the O2, facing off in the final for the year-end number one ranking.
Niki Poonacha earns Grand Slam debut, wins Australian Open wild card play-off with Thai partner
Fonseca cruised through the first set before Fearnley found his groove in the second to level the match on a windy day in the California desert.
Carlos Alcaraz was pushed all the way by fellow-Spaniard Jaume Munar in a thrilling contest
American wild card Ryan Sweeting completed his unlikely tournament run by capturing the US Clay Court Championship with a 6-4, 7-6 victory over Japan's Kei Nishikori on Sunday.
France's Boisson wins first WTA title in Hamburg
Cousins Valentin Vacherot and Arthur Rinderknech will meet in the Shanghai Masters final after pulling off stunning upsets of former champions Novak Djokovic and Daniil Medvedev in the semifinals on Saturday.
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.
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.
Unheralded Joao Sousa completed a fairytale run at the Malaysian Open on Sunday when he beat France's Julien Benneteau 2-6, 7-5, 6-4 in the final to become the first Portuguese to win an ATP Tour title.
Russian Nikolay Davydenko has won his appeal against a fine for not trying hard enough during a match.
'My dad is trying to retire me for a while now ...
Japan Open: Alcaraz marches into quarterfinals, hails "best physio in the world" after overcoming ankle issues
Jannik Sinner became the first Italian to win the ATP Finals title following a dominant 6-4, 6-4 victory over American Taylor Fritz.
