Spain's David Ferrer, his eyes fixed on qualifying yet again for the ATP World Tour Finals, romped past fellow Spaniard Guillermo Garcia-Lopez 6-1, 6-1 to reach the quarter-finals of the Vienna Open on Thursday.
The match marked world number two Medvedev's ninth win in a row at the ATP Finals and he improved his head-to-head record over Ruud to 3-0.
Third seeds Mahesh Bhupathi and his Bahamian partner Mark Knowles opened their campaign at the ATP World Tour Finals on a resounding note, notching up a straight-set win over debutants Frantisek Cermak and Michal Mertinak in their first group A doubles match in London.
'I'm always surprised when I walk off court after a final and I'm like 'where is anti-doping?'
Novak Djokovic's bid to add a 100th singles title to his trophy cabinet on Sunday was dashed after he was beaten 7-6(4), 6-3 by world number one Jannik Sinner in the Shanghai Masters final on Sunday.
Indian tennis ace Leander Paes and his German partner Andre Begemann squandered as many as five match points in the second set to eventually lose the summit clash against Guillermo Garcia-Lopez and Henri Kontinen in a three-setter at the ATP Winston-Salem Open.
Novak Djokovic dug out a 6-7(4) 6-1 6-4 win over Czech Jakub Mensik on Friday to advance to the semi-finals of the Shanghai Masters, where he will face Taylor Fritz.
World No 1 Novak Djokovic was beaten by Tomas Machac in the Geneva Open semi-finals.
Richard Gasquet won his first ATP title in more than two years when he continued his domination of Gilles Simon by swatting aside his French compatriot 6-2, 6-1 to claim the Thailand Open on Sunday.
Rafael Nadal reached the final of the Swiss Indoor tournament when he beat Frenchman Richard Gasquet 6-4, 7-6(7) on Saturday, a result that was good news for fellow Spaniard David Ferrer.
Dimitrov was showing signs of fatigue from his three-hour third-round match earlier in the week and could do little to stop the Spanish world number three, who next faces Argentine Francisco Cerundolo.
Italy's Sinner and Spain's Alcaraz have won two Grand Slams each this year, with Alcaraz beating Sinner in closely fought clashes at the French Open semi-finals and the China Open final.
Americans Bob and Mike Bryan beat Max Mirnyi and Andy Ram 7-6, 6-3 on Sunday to win the doubles title at the ATP World Tour Finals and regain the end-of-season number one ranking.
Andy Murray called on umpires to get tough on players taking too long between points on Thursday after being made to work hard for victory against a determined Fernando Verdasco at the ATP World Tour Finals.
Serbia's world number one Novak Djokovic will return to Davis Cup action after a season's absence when he leads his country against Croatia in the first round in March, he said on Wednesday.
Sinner remains the man to beat at Melbourne Park even as doping officials seek a two-year ban for the world number one for failing two drugs tests last March.
Andy Murray could beat Roger Federer on Thursday and crash out of the ATP World Tour Finals or lose and go through to the semi-finals -- such is the conundrum he faces.
Five-time champion Roger Federer brushed aside Lukas Rosol on Thursday to set up a mouthwatering semi-final clash with Novak Djokovic in the Dubai Championship.
Retired tennis great Andy Murray has agreed to join Novak Djokovic's team and will coach him at the Australian Open next year, the Serbian 24-times Grand Slam champion said on Saturday.
Stefanos Tsitsipas confirmed his meteoric rise into the highest echelon of men's tennis by battling back to beat Austrian Dominic Thiem 6-7(6) 6-2 7-6(4) in a compelling title duel at the ATP Finals on Sunday.
Former world number one Novak Djokovic, the last surviving member of tennis' "Big Four", said he does not plan on stopping any time soon but admitted that the retirement of rivals Roger Federer, Andy Murray and Rafa Nadal has been overwhelming.
World No 1 Andy Murray started his new season with a surprise 7-6(4), 6-4 loss to David Goffin in the semi-finals of the Mubadala World Tennis Championship in Abu Dhabi on Friday.
Third seed Alexander Zverev eased past home favourite Ugo Humbert
Sasikumar Mukund will aim for a winning return to the Davis Cup fold as India faces Togo in the World Group I Play-off.
Spain's Rafael Nadal defeated local boy Di Wu in straight sets to reach the second round of the China Open on Tuesday.
'We feel blessed to have been able to play the game of doubles for so long. We are grateful to have had the opportunities in the beginning of the year to play and say our goodbyes to the fans.'
Tatsuma Ito and Michal Przysiezny claimed the biggest wins of their careers at the Japan Open on Tuesday when the local wildcard knocked out top seed Stan Wawrinka and the Polish qualifier saved match points to beat Jo-Wilfried Tsonga.
Roger Federer won the inaugural Istanbul Open on Sunday, beating third seed Pablo Cuevas 6-3, 7-6 (11) for his first clay title in three years.
Juan Martin del Potro took advantage of an error-strewn Marin Cilic performance to beat the defending champion for a seventh time in a row on Saturday to set up another Swiss Indoors final showdown with Roger Federer.
No clear favourite for Australian Open, says Djokovic
The last time the Swiss maestro was this far down in the ATP rankings was all the way back on January 2001, when Federer was just 19 years old. Notably, he was yet to win his first tour title.
Roger Federer set up a mouthwatering semi-final with Rafael Nadal at the ATP World Tour finals after battling past Juan Martin del Potro in their Group B shoot-out.
World No 5 Kei Nishikori has withdrawn from this week's Shanghai Rolex Masters due to an injury to his left gluteal muscle.
The 25-year-old Dzumhur recovered from a poor start to beat the Briton 1-6, 7-5, 6-3 and will bid to become the Balkan nation's first Tour winner in Saturday's title-decider against Spain's Roberto Bautista Agut.
Serbian tennis superstar Novak Djokovic has said that he thinks former World No.1 Roger Federer, who he faces on Tuesday at the ATP World Tour Finals, is noticeably slower on court.
Should Carlos Alcaraz win Queen's final against Alex de Minaur he would reclaim the world number one ranking from Novak Djokovic.
Indian Davis Cupper Rohan Bopanna dropped out of the top-10 in the ATP doubles ranking after finishing last along with Pakistani partner Aisam-ul-haq Qureshi in group B of the season-ending finale in London.
Yuki Bhambri and his Dutch partner Robin Hasse went down in straight sets to Ivan Dodig and Austin Krajicek at the Dubai Duty Free Tennis Championships.
Daniil Medvedev destroyed his racket and a net camera in a mid-match meltdown as he survived a huge scare against Thai wildcard Kasidit Samrej.
Top seed Roger Federer was finally forced to work hard for a win at the Swiss Indoors tournament as he fought back to beat Adrian Mannarino 4-6, 6-1, 6-3 in his quarter-final on Friday.