Rotterdam Open top seed Stefanos Tsitsipas and defending champion Felix Auger-Aliassime were joined by Daniil Medvedev in progressing through their first-round ties.
Auger-Aliassime won his first Tour-level title at the event last year and went from strength to strength in 2022, winning another three singles trophies.
The world number eight, seeded third, started his title defence with a convincing 6-2 6-3 defeat of Italy's Lorenzo Sonego on Tuesday.
"Of course, I was hoping to win and get through, but 6-2, 6-3 is a great performance against a player that is tricky like he is... it's a great way to start the week," said Auger-Aliassime, who needed just 82 minutes to clinch victory and set up a last-16 meeting with qualifier Gregoire Barrere.
The Canadian is relishing his title defence, and feels he is a stronger competitor than this time last year in a warning shot to his rivals.
He added: "Last year was an amazing year, but this year is a different one. I think I'm a better player overall.
"Of course, the best thing I can do compared to last year is win again, so hopefully I can do that. The draw is really strong, but I'm confident if I can keep playing the way I did today I'll get my chances and then we'll see."
Auger-Aliassime might be the reigning champion, but world number three Tsitsipas is the favourite.
Emil Ruusuvuori was no match for Australian Open runner-up, who prevailed 7-5 6-1 and has a 13-1 record for the season.
"The process that you get to repeat these things over and over again, it gives you tremendous understanding of how things actually work," Tsitsipas said.
"I think being able to get in these moments more and more often on the Tour helps you understand, makes you wiser when you're trying to deal with all these problems."
Tsitsipas, who could face Open Sud de France champion Jannik Sinner in the next round, ensured there would be no curse of the top seed in Rotterdam, where the favourite had lost their first match in two of the last three editions.
On both occasions (2020 and 2021), that was Medvedev, but the former world number one fought from a set down to beat Alejandro Davidovich Fokina 4-6 6-2 6-2.
World number 10 Hubert Hurkacz also had to battle against a Spaniard in the form of Roberto Bautista Agut. The fifth seed needed three hours to win 7-5 6-7 (7-9) 7-6 (7-4) and tee up an encounter with Grigor Dimitrov.
Alexander Zverev defeated Soonwoo Kwon in straight sets to book his progress, while Gijs Brouwer got the better of Marc-Andrea Huesler.
'The numbers don't lie' – Djokovic hailed as greatest of all time by Lopez
Novak Djokovic is just one grand slam away from becoming the most decorated player in history and Feliciano Lopez believes "the numbers don't lie" when it comes to debating tennis' greatest.
Serbia's Djokovic equalled Margaret Court's record of 24 grand slam triumphs after defeating Daniil Medvedev in straight sets at the US Open earlier in September.
That made the world number one, aged 36 years and 111 days at the time, the oldest winner of the men's singles title at the US Open.
It was also Djokovic's third major crown of 2023, winning a trio of grand slams in a calendar year for the fourth time in his career,
Davis Cup tournament director Lopez, who had previously hailed Djokovic for featuring at the "unique" competition, suggested no one in history compares with the 36-year-old.
Asked by Stats Perform if Djokovic was the GOAT – greatest of all time – Lopez said: "According to the numbers, yes. The numbers don't lie.
"If you look at the stats, Novak is the best. So, I mean, what can I say?
"I think the numbers are very clear, not only by the fact that he's won 24 slams, but also there are other numbers and other statistics that clearly show he's the best player who ever played the sport.
"According to the numbers, I cannot say anything different."
Djokovic triumphed at the Australian Open, French Open and US Open, only missing out on a clean sweep of the majors after losing the Wimbledon final to Carlos Alcaraz.
As for Djokovic's chances for more major success going forward, Lopez believes the sky is still the limit.
"It's very difficult to predict honestly, but as long as he's feeling physically strong I think it's clear that his will in the last three or four years is to keep winning grand slams," Lopez added.
"If he is able to sustain his physical condition for the next two years, I can fairly say that he can win, I don't know, two, three or four, but it's very difficult to say one number because this year, for example, he could have won all four.
"He won in Australia, he won in Paris, he was very close to winning Wimbledon because of that second-set tie-break, and he just won the US Open.
"You ask me how many grand slams you think he will win in the future when he just won three of them in the same year!
"I don't know, maybe three or four more is fair to say, but it's very difficult to predict."
Next season I’ll be back – Emma Raducanu out for rest of year through injury
Emma Raducanu has revealed she will be sidelined for the remainder of the year.
The 20-year-old Briton was forced to miss the recent US Open, as well as the French Open and Wimbledon earlier this year, after undergoing operations on both wrists and one ankle at the beginning of May.
Raducanu, who fell out of the world’s top 200 this week, had hoped of an autumn comeback after she returned to the practice court last month.
But she told BBC Sport: “Next season I’ll be back. This season all the slams were finished so it was difficult to watch them go by but I was trying to stay in my lane as much as possible and keep focused on my recovery.”
Raducanu has been dogged by injuries since her 2021 US Open victory.
She has played only 10 matches this year and has failed to make it beyond the second round of any grand slam since her superb Flushing Meadows triumph.
Great Britain face Novak Djokovic’s Serbia in Davis Cup quarter-finals
Great Britain have been drawn to play Novak Djokovic’s Serbia in the Davis Cup quarter-finals in Malaga.
Britain secured their place in November’s knockout stage by finishing top of qualifying Group B on Sunday night after their thrilling 2-1 win against France.
Defending champions Canada will face Finland, the Czech Republic play Group B runners-up Australia and the Netherlands take on Italy.
The final eight nations will compete for the 2023 Davis Cup in Malaga from November 21-26.
Britain secured their place in this year’s finals after Dan Evans and Neal Skupski saved four match points in their decisive doubles match against French pair Nicolas Mahut and Edouard Roger-Vasselin at a sold-out AO Arena in Manchester.
Evans and Skupski clinched a 1-6 7-6 (4) 7-6 (6) win in the deciding rubber after earlier 2-1 wins against both Australia and Switzerland.
Britain captain Leon Smith opted to play his highest-ranked duo Cameron Norrie and Evans in the singles against France.
Andy Murray and Jack Draper had featured against Switzerland and Australia respectively, while world number three in the doubles rankings Skupski completed the five-man line-up.
Smith is confident Britain can mount a serious challenge to repeat their success of 2015 when Murray led them to their last Davis Cup win with victory over Belgium in the final.
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