Novak Djokovic continued his perfect record at the ATP Cup to help Serbia beat Canada in their opening tie.
The world number one won all eight of his rubbers in the 2020 tournament and made a fine start to this event by battling to a 7-5 7-5 win over Denis Shapovalov in Melbourne.
Milos Raonic had earlier put Canada in front when he beat Dusan Lajovic 6-3 6-4, meaning Djokovic had to return for a decisive doubles clash alongside Filip Krajinovic.
The Serbians prevailed, winning 7-5 7-6 (7-4) against Shapovalov and Raonic.
"Filip Krajinovic was the key," Djokovic said after the doubles triumph extended his undefeated run to 10.
"The way he played is phenomenal. He came out with very solid returning. He found his serve, great rhythm. He just played some really key shots in the second set when we needed it the most."
Of his singles win, Djokovic added: "It was a very close match. Playing Shapo is always a great challenge on hard courts.
"He's such a dynamic, explosive player; very talented. I thought we played on a very high level, so I'm really pleased with how I've started the season.
"This is the best way to kickstart the season, playing for your country.
"We don't get to see crowds in the tennis stadiums these days so much, so it's definitely a blessing. I'm really grateful to see you guys here in the stands."
SPAIN WIN WITHOUT NADAL
Defending champions Spain were without Rafael Nadal for their tie against Australia, but they still prevailed.
Pablo Carreno Busta had few problems seeing off John Millman 6-2 6-4.
And Roberto Bautista Agut ensured the tie was won before the doubles by emerging triumphant in an entertaining encounter with Alex de Minaur, which the Spaniard won 4-6 6-4 6-4.
Nadal, who is battling a back problem, hopes to return on Thursday when Spain take on Greece.
Elsewhere, Austria fell to a 2-1 loss against Italy, as US Open champion Dominic Thiem struggled.
After team-mate Dennis Novak had superbly beaten Fabio Fognini, world number three Thiem fell to a surprise 6-2 6-4 loss against Matteo Berrettini, with Austria going on to lose the decisive doubles.
Andrey Rublev and Daniil Medvedev beat Guido Pella and Diego Schwartzman respectively as Russia produced an impressive performance to beat Argentina.
Elsewhere, at the Murray River Open, Nick Kyrgios made a winning start to his comeback after a year out of action.
He did not have it easy against the unheralded Frenchman Alexandre Muller, but salvaged a 3-6 6-4 7-6 (7-4) victory to book a second-round meeting with fellow Australian Harry Bourchier.
Murray knocked out of Geneva Open as Hanfmann books Djokovic clash
Andy Murray was denied a meeting with Novak Djokovic at the Geneva Open as Yannick Hanfmann completed a 7-5 6-2 win over the Scot on Tuesday.
Murray's first-round clash with Hanfmann was suspended due to rain on Monday, with the three-time grand slam champion 7-5 4-1 down.
He had earlier fumed at umpire Greg Allensworth as pollen rained down on the court in Switzerland, questioning why play had not been stopped.
The rain may have frustrated Hanfmann's victory pursuit on Monday, but it only provided a temporary reprieve for Murray as the players returned to complete the match the next day.
Hanfmann held his nerve through his final two service games to book a meeting with Djokovic for Wednesday.
In Tuesday's other early match, four-time grand slam quarter-finalist David Goffin was beaten in straight sets by Nicolas Moreno De Alboran.
The likes of Denis Shapovalov and Tallon Griekspoor are also in action in Switzerland on Tuesday, with Taylor Fritz and Casper Ruud joining Djokovic in entering for the second round on Wednesday.
Murray fumes at umpire amid severe weather at Geneva Open
Andy Murray fumed at the umpire as inclement weather forced his Geneva Open tie with Yannick Hanfmann to be suspended.
Murray's meeting with Hanfmann was postponed with the Scot a set and a double break down, with his German opponent in control at 7-5 4-1.
Former world number one Murray was furious with umpire Greg Allensworth as the weather closed in.
"I know you guys don't play but it'd be good to have a bit of a feel for what's happening," said Murray during a break in play.
"You're fine for us to play when there's s*** flying around?
"It's like it's snowing out here and you still want us to keep going."
Allensworth eventually sent the players into the dressing rooms.
Murray is aiming to use the Geneva Open to prepare for what is set to be his first French Open appearance since 2020.
A tie with Novak Djokovic is on the cards if Murray can turn things around on Tuesday, though it looks incredibly unlikely.
Zverev sees off Jarry to claim second Italian Open crown
Alexander Zverev claimed his second Italian Open title following a 6-4 7-5 victory over Nicolas Jarry in the final.
The German, who also triumphed in Rome seven years ago, captured his first silverware of the season - and sixth of his career in an ATP Masters event.
Having dropped just a single set on the way to his 11th Masters final, Zverev continued his impressive form by winning 95 per cent of his first-serve points (37 out of 39) and committing just eight unforced errors.
Jarry had enjoyed an impressive fortnight in Rome, defeating Stefanos Tsitsipas and Tommy Paul on the way to becoming the first Masters finalist from Chile since Fernando Gonzalez (also at the Italian Open) in 2007.
However, just two break points were enough to deny the 21st seed a fourth career ATP title, with Zverev eventually converting his fourth championship point to ensure a return to the winner's circle.
Data debrief
Zverev joins Rafael Nadal (10) and Novak Djokovic (six) as one of only three players since 2000 to win the Italian Open on multiple occasions.
Landing his second crown in Rome seven years after his first, it marks the longest gap in seasons between two men's singles titles at the event in the Open Era.
Meanwhile, Zverev became the most successful German male in ATP Masters events since the format's introduction in 1990, with his sixth such success seeing him eclipse Boris Becker's total of five.
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