World number one Novak Djokovic breezed into the Monte Carlo Masters quarter-finals, but Britain’s Cameron Norrie could not progress from the last 16.
Serbia’s Djokovic, 31, needed just one hour and eight minutes to win 6-3 6-0 against American Taylor Fritz.
Norrie lost 6-2 7-5 to Italian Lorenzo Sonego, ranked 40 places below him.
The British number two, who is set to rise into the top 50 next week, was broken four times and struggled to test Sonego’s serve.
Norrie, 23, did break back when Sonego served for the match at 5-4, only to lose his serve in the next game as the Italian went on to seal victory with a hold to love.
Top seed Djokovic converted six of 10 break points against Fritz as he moved closer to matching Rafael Nadal’s record of 33 Masters titles.
The reigning Wimbledon, US Open and Australian Open champion will face a last-eight meeting with Russian 10th seed Daniil Medvedev – who he beat on his way to victory in Melbourne in January and has not lost against in three meetings.
Medvedev, 23, continued his good form against Greece’s Stefanos Tsitsipas, winning 6-2 1-6 6-4 to extend to four victories his 100% record over the ATP Next Gen champion – who doubled faulted on match point.
Italian 11th seed Marco Cecchinato was knocked out after a 6-4 4-6 6-4 defeat by Argentina’s Guido Pella.
Great Britain v Kazakhstan – Fed Cup World Group II play-off
Venue: Copper Box Arena, London Dates: 20-21 April 2019
Coverage: BBC website will have live text commentaries on all GB matches and you can listen to BBC Radio 5 live commentary online
British number one Johanna Konta is hoping for more of the home-crowd energy that pulled her back from the brink of exhaustion in their last tie when GB seek Fed Cup promotion this weekend.
Britain face Kazakhstan in a best-of-five play-off at London’s Copper Box Arena, with Konta and her team-mates hoping to end a 26-year wait for promotion to Fed Cup World Group II.
It is the fifth time in eight years Britain have reached the play-offs and every previous tie has been away from home, with defeats keeping them in the third tier of women’s team tennis.
This year they earned their place with victory in February’s round-robin event in Bath, where Konta battled fatigue and needed to be helped to her feet at the end of her match in the decisive win against Serbia.
“The home support lends you energy when you need it,” Konta, 27, told BBC Sport.
“You really feed off their emotions and their desires for you. It is also the team you have behind you.”
Konta’s world ranking has dropped from 23 to 46 in the past 12 months but she made changes to her coaching team in November and reaped the rewards with a determined performance in Bath.
“Overall, I feel good about the work I am putting in with my own team,” she said. “I am enjoying my tennis and enjoying my life so it’s a good position to be in.”
This is the third consecutive year Great Britain have reached this stage, with last year’s efforts ending in a heartbreaking 3-2 defeat by Japan after Konta and Watson had been a set up in the deciding doubles match.
“I’m sure eventually we will take our chance. We will give it our best,” said Watson.
“We don’t talk much about the past. We just talk about the future.”
Watson, overtaken by Boulter as British number two earlier this year, will also want to put behind her the disappointment of missing February’s Europe/Africa Zone round-robin event with flu.
“I was the most ill I’ve been in my life. It was dreadful,” she said. “I had a temperature, I was vomiting, I was coughing – I even damaged a rib from coughing too much.
“I was there but I was bed-bound the whole time. I just hoped that each day I could get better so I could go and even just support. It was a shame because I have played in the Fed Cup for so many years and this was the first time it was at home. I was really sad to miss it.
“I will at least be courtside this time around and will hopefully get to play because that would be really special to play at home.”
‘I live for the big moments’ – Boulter
Boulter enjoyed a dream Fed Cup singles debut in Bath, winning all of her rubbers in a performance Konta described as “exceptional”.
The 22-year-old now has her sights on improving her ranking and one day becoming British number one.
“It is great to have that healthy competition within the team,” she told BBC Sport. “We are all fighting for that place and that chance to show that we are working hard to do the best that we can. It’s good for Jo and it’s good for Heather and all the other girls coming up.”
Boulter says she was not fazed by the pressure of playing the opening match in every tie in Bath and wants to do the same in London.
“I am somebody who likes to get the crowd going and show emotion. I live for the big moments,” she said. “Hopefully I can get a lot of support. It’s a good start for everybody and it worked well in Bath so hopefully we can keep the winning formula.”
And Keothavong believes there is an opportunity for her players to become strong role models like the three-time Grand Slam champion.
“The players we have on the Fed Cup team deserve the attention they get and more,” she said. “They are not Grand Slam champions yet, like Andy, but there is lots of potential.
“There is the appetite for women’s tennis and it’s important we have strong role models in this country. Every member of the Fed Cup team can be a strong role model for any young tennis player aspiring to do what they are doing.”
She also hopes playing a tie in her native east London, which has never hosted a Fed Cup or Davis Cup tie, will open up the sport to a new audience.
Konta agreed, adding: “We are all really looking forward to the fact we are playing at home again. We have not had to travel across the world at this time of the year, which is a new experience for us.
Britain’s Dan Evans has earned a place in the main draw at next month’s French Open at Roland Garros.
He is joined by compatriots Kyle Edmund and Cameron Norrie in the draw for the men’s singles, while Britons Johanna Konta and Katie Boulter are entered into the women’s singles.
It is the first time in two years that the world number 89 has made the main draw by ranking.
Evans, 28, returned from a one-year ban for taking cocaine 12 months ago.
He has only once before played in the first round of the French Open, in 2017, when he was beaten by Spain’s Tommy Robredo.
Edmund reached the third round in 2018, while Norrie exited in the second. Two-time Grand Slam semi-finalist Konta has never progressed past the first round, while this year marks Boulter’s debut in the main draw.
The French Open takes place in Paris between 20 May and 9 June.
Glasgow will again host an ATP Challenger event this year, the Lawn Tennis Association has announced.
Singles and doubles events will take place at Scotstoun Sports Campus from 16-22 September.
Last year’s inaugural event was attended by more than 3,000 spectators with Slovakia’s Lukas Lacko winning the singles.
“Some of the best memories have been playing Davis Cup ties at home,” said Scottish doubles player Jamie Murray.
“I am delighted to be working with the LTA and Glasgow Life on the planning and delivery of an ATP Challenger in Scotland later this year.”
Murray, who has played a role in the planning of the event, added: “We hope to make this year’s tournament more successful, providing a platform to inspire more young people in Scotland to take up our sport.
“I look forward to seeing everyone again in September.”