Daniil Medvedev quietened the home crowd in Sydney as he dispatched Australia's Alex De Minaur in straight sets to seal victory for Russia in the ATP Cup.
Medvedev, who led Russia to victory in last year's tournament, lost his first singles match at the 2022 edition, going down to France's Ugo Humbert.
However, the US Open champion hit back in convincing fashion against De Minaur, winning 6-4 6-2 in 80 minutes.
Medvedev's win took Russia into an unassailable 2-0 lead prior to the doubles encounter between the two nations, which the world number two also featured in alongside the in-form Roman Safiullin, who made it three wins from as many games by overcoming James Duckworth 7-6 (8-6) 6-4.
The Russian duo then made sure of a 3-0 match win in the doubles, coming back from losing the second set to triumph 10-6 in the decider.
"We fight when we play for our country, to the last point," said Medvedev, who also revealed he felt unwell before his singles game and had to take painkillers.
"I'm really happy for Roman, he's winning every match he's played so far. I watched his match tonight from the locker room. I've known him since he was 10, he had a good junior career and has been unlucky with injuries."
Russia have put themselves in a strong position to qualify from Group B, though they face Italy – in a repeat of last year's final – in their last match, with Australia taking on France, who are already eliminated.
France's elimination came at the hands of Italy, with Matteo Berrettini's singles win over Humbert was enough to secure victory for the 2021 runners-up.
Great Britain suffered disappointment in Group C, with Canada's Felix Auger-Aliassime and Denis Shapovalov coming out on top 6-4 6-1 in the decisive doubles encounter against Joe Salisbury and Jamie Murray.
Dan Evans defeated Shapovalov in straight sets to nudge Great Britain ahead, yet Auger-Aliassime started Canada's comeback with a 7-6 (7-4) 6-3 win over Cameron Norrie.
It is all to play for in that group, with Germany having overcome the United States 2-1 – world number three Alexander Zverev in commanding form once more.
That leaves all four teams on 1-1 records and in with a chance of making the semi-finals.
World number one Swiatek sees off Xiyu in Madrid opener
World number one Iga Swiatek overcame Wang Xiyu with the minimum of fuss on Thursday to progress to the third round of the Madrid Open.
Swiatek has yet to win the title in Madrid, which is the only clay-court European event at which the Pole has not triumphed, but she got off to a flying start with a 6-1 6-4 victory over Xiyu.
"I love this place. I got to know the city a little better last year," Swiatek said. "So this time I feel more comfortable around."
Next up for the 22-year-old is a third-round tie against 27th seed Sorana Cirstea on Saturday.
Data Debrief
Swiatek has registered 150 match wins on the WTA Tour since the start of 2022. Elena Rybakina and Coco Gauff are the next best with 108 wins each.
She also became the first player born this century to claim 50 combined match wins in Madrid, Rome and Roland-Garros, since the inaugural women's singles event at the Madrid Open in 2009.
Dominant Gauff double bagels Rus at Madrid Open
Coco Gauff made a flying start to her Madrid Open campaign on Thursday, recording the first double bagel main-draw win of her career as she cruised past Arantxa Rus to reach the round of 32.
Gauff needed just 51 minutes to see off 33-year-old Rus as she booked a meeting with Ukraine's Dayana Yamstremska for Saturday.
The US Open champion lost just 18 points throughout the match – eight in the opener and 10 in the second set – as she put any doubts over her recent form to bed in emphatic fashion.
Gauff's power proved too much for Rus in the opener, the third seed winning 88 per cent of points behind her first serve and converting three of four break points to go a set up in just 23 minutes.
Rus brought up four break points midway through the second set, but when she failed to convert them, Gauff punished her in ruthless fashion by reeling off another three games then finishing things with a terrific forehand winner.
Speaking after her win, the American said: "I played really well today. It was just one of those days for me… 6-0 6-0, I've never done that before, I'll probably never do it again."
Data Debrief: Gauff matches Azarenka, Halep feat
Gauff is just the third player to register a 6-0 6-0 win in the women's singles draw at the Madrid Open, following in the footsteps of two former world number ones in Victoria Azarenka and Simona Halep.
The American, who only turned 20 last month, is also the youngest player to double bagel an opponent in any main-draw match on the WTA Tour since Iga Swiatek did so against Karolina Pliskova in the 2021 Italian Open final in Rome.
Nadal cruises past teen Blanch to tee up De Minaur rematch in Madrid
Darwin Blanch presented little challenge for Rafael Nadal, who dropped just one game in a convincing 6-1 6-0 triumph at the Madrid Open.
Nadal is feeling his way back to fitness, but 16-year-old qualifier Blanch offered little resistance to the 22-time major champion on Thursday.
Making his farewell appearance at the Madrid Open, where he has won five titles, Nadal needed just 64 minutes to progress to round two.
"I think today I played against an opponent with a great future in front [of him], but today, still making mistakes," said Nadal.
"I just tried to be there, be solid all the time without taking a lot of risks. It worked well. I'm happy to be through and I wish him all the very best for the future."
Nadal's reward is a rematch with Alex de Minaur, who he lost to last week in Barcelona.
Data Debrief
This game saw the largest age gap (21 years, 117 days) between two opponents in the history of ATP Masters 1000 events.
Nadal has now registered 57 wins at the Madrid Open, which is 20 clear of any other player.
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