Daniil Medvedev and Karen Khachanov crushed second seed Dominic Thiem and third seed Alexander Zverev respectively to set up an all-Russian semi-final at the Rogers Cup in Montreal on Friday.
World number 30 Berrettini saved five points in the marathon second set tiebreak and held on to win it 13-11 for his third ATP crown in last 11 months.
This time last year, Federer was the pundits' pick to claim a third Grand Slam title of 2017 in New York, after roaring back from a season decimated by injury to win the Australian Open and Wimbledon.
Russian youngster Daria Kasatkina's stirring run to the French Open quarter-finals left her temporarily homeless in Paris on Monday.
Former world number one Novak Djokovic showed signs of rediscovering his form with a dominant 6-0, 6-1 victory over Dusan Lajovic in the opening round of the Monte Carlo Masters.
Roger Federer made a smart decision by pulling out of this month's French Open, where he has less chance of adding to his 18 Grand Slam titles than on the sport's quicker surfaces, world number two Novak Djokovic said on Thursday.
Indian tennis ace Sania Mirza and her Swiss partner Martina Hingis lost the opportunity to win their 14th title together after losing the Stuttgart Open final on Sunday.
Japan's Kei Nishikori, who will arrive at Roland Garros without an ATP title for more than two years and desperate to prove that his career has not already peaked.
Summary of sports events and persons who made news on Tuesday
The 32-year-old, who has not played since retiring injured in the US Open semi-finals, cited an abdominal injury.
"I feel like I'm more... I wouldn't say confident but I'm more, like, I have inner peace. I don't know. Like zen. I don't really want to use words I don't know.'
'I wouldn't say my son deserved more money than my daughter because he's a man.'
Roger Federer and Rafael Nadal have returned to tennis in blistering form this season because they were able to recharge during injury layoffs last year, former world number two Alex Corretja has said.
A tenacious Roberto Bautista Agut battled back to beat world number one Novak Djokovic 1-6, 7-5, 6-3 and advance to the quarter-finals of the Miami Open on Tuesday as the Spaniard claimed his second win over the Serb this year.
Images from Day 6 of the US Open in New York, on Saturday.
The top-seeded duo battled past the Rodionova sisters of Australia, Anastasia and Arina, 6-7, 6-3, 10-5 in their opening round match of the US $731,000 clay-court event.
Defending champion Caroline Wozniacki and former winner Maria Sharapova cruised into the third round of the Indian Wells WTA tournament with 6-2, 6-0 victories on Saturday.
Roger Federer suffered a shock 3-6, 6-3, 7-6(4) defeat to Australian wildcard Thanasi Kokkinakis on Saturday that will cost the Swiss his world number one ranking and leaves the Miami men's tournament wide open.
Japan's Naomi Osaka claimed her first career title with a commanding 6-3, 6-2 victory over Russian Daria Kasatkina in a battle of 20-year-olds at the BNP Paribas Open on Sunday.
Amid rising speculation on who is going to partner Sania Mirza at the Rio Olympics, contender Rohan Bopanna says his sole focus now is to maintain his top-10 ranking till the French Open in June. While veteran Leander Paes has already said that he is the ideal partner for Sania, Bopanna said a lot of scenarios can play out before the Rio Games in August. "I will play all the big tournaments there are on the calendar before Rio, starting from Dubai to Indian Wells, Monte Carlo, Rome, French Open. The aim is to be in the top-10 till the French Open and we will see who can partner who, be it doubles or mixed doubles. So there is a long way to go before Rio," Bopanna told PTI on Friday.
Defending champion Sloane Stephens was sent packing from the Miami Open on Sunday after a 6-3, 6-2 loss to Germany's Tatjana Maria in the third round.
Andy Murray has dismissed suggestions that the pressure of being the world's top tennis player is affecting his performance after losing to Spaniard Albert Ramos-Vinolas in the Round of 16 of the Monte Carlo Masters.
Sticking to a limited schedule has helped Roger Federer enjoy a renaissance late in his career but the Swiss says rest time is now over and he is looking forward to returning to action at the Mercedes Cup in Stuttgart.
A vicious topspin forehand modelled on her idol Rafael Nadal's weapon-of-choice got Daria Kasatkina out of a spot of bother in a topsy-turvy third-round match against Maria Sakkari at the French Open on Friday.
German tennis star Angelique Kerber, who has surged back to the world number one ranking by virtue of Serena Williams' injury, has said that the top spot is not really important for her.
The Canadian's win sets up a semi-final clash with Del Potro on Saturday that will pit power against power.
First look: Tennis star Wozniacki meets Justin Beiber
Novak Djokovic barely got out of first gear but had more than enough in the tank to beat Briton Kyle Edmund 6-3, 6-3 in the second round of the Miami Open on Friday.
A summary of the second day's play at the US Open.
Former world number one Novak Djokovic showed signs of a return to form with an impressive 7-5, 6-4 victory over Japan's Kei Nishikori in the opening round of the Madrid Open on Monday.
German fourth seed Alexander Zverev beat Spaniard Pablo Carreno Busta 7-6(4) 6-2 on Friday to set up a Miami Open final showdown against big-serving American John Isner, who earlier overwhelmed Juan Martin del Potro.
Having exchanged a few shots with a young prospect after an intense training session in searing heat at his own tennis complex in central Belgrade, the 30-year old Serb conceded that the last 18 months have been testing.
'If I was a lady player, I'd go down every night on my knees and thank God that Roger Federer and Rafael Nadal were born.'
A round-up of sports action from around the world.
Juan Martin del Potro could be a 'nightmare opponent' for Rafael Nadal when they clash in the French Open semi-finals on Friday, according to former champion Mats Wilander.
Pliskova, a finalist at last year's US Open who reached the semi-finals at Indian Wells last week, relied on her booming groundstrokes and strong returning to dispatch her American opponent in 59 minutes.
The tournament will be Murray's third since hip surgery in January and mark his return to the hard courts for the first time since March 2017 at Indian Wells.
Grigor Dimitrov stood one win away from the biggest title of his career on Saturday after ending his Jack Sock jinx to reach the final of the season-ending ATP Finals at the 02 Arena.
Svetlana Kuznetsova has the versatility and mentality to mark her out as the 'best player' on the WTA Tour.
A summary of sports events and persons who made news on Monday
