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Stan Wawrinka may be wondering what he got himself into when he announced his 2026 retirement tour. At this rate, it may not last until the end of January. Over the last two nights in the United Cup, the 40-year-old has played two marathon three-set matches against significantly younger opponents. He won the first, over Arthur Rinderknech, 7-6 in the third, and almost won the second, against 23-year-old Flavio Cobolli, before finally running out of gas at the finish line and falling by the same score.

Elsewhere, it was a fairly one-sided night in the team competition. Germany beat the Netherlands 3-0, Canada beat China 3-0, Great Britain beat Japan 2-1. The most notable non-Stan result may have been Naomi Osaka’s second straight defeat, to 276th-ranked Katie Swan, who was filling in for an injured Emma Raducanu.

What’s next in Sydney and Perth? Here’s a look at Monday’s lineup. Stan, it seems safe to say, will be happy to have the night off.

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Who’s playing who?

Sydney

Czechia vs. Norway (10:30 A.M. local time; 6:30 P.M. ET)

Germany vs. Poland (5:30 P.M. local time; 1:30 A.M. ET)

Perth

USA vs. Spain (10:00 A.M. local time; 9:00 P.M. ET)

Great Britain vs. Greece (5:00 local time; 4:00 A.M. ET)

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HIGHLIGHTS: Coco Gauff & Christian Harrison win United Cup mixed doubles decider over Argentina

Who to watch

Jakub Mensik vs. Casper Ruud: The 20-year-old Mensik is one of the bigger question marks of the coming season: Will he be the guy who won a Masters 1000 in Miami, or the guy who failed to make another semifinal the rest of the year? He’ll start his 2026 with a high-profile encounter against Ruud, who looked good in a win over Alex de Minaur two nights ago. Mensik won their only previous meeting, at the Australian Open last year.

Alexander Zverev vs. Hubert Hurkacz: The Pole returns to the court after knee surgery ended his 2025 early. Zverev leads their head to head 3-1.

Iga Świątek vs. Eva Łys: On paper, Świątek should have a smooth start to her new year. She has played Lys three times and surrendered just seven games in total. But the 23-year-old Ukrainian-German is improving.

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Coco Gauff vs. Jessica Bouzas Maneiro: Round 2 for Coco, and her serve should get a proper test. The American and the 40th-ranked Spaniard have never played.

Taylor Fritz vs. Jaume Munar: This should be an interesting stylistic clash, between server and grinder. Fritz won their only meeting, in a third-set tiebreaker in Indian Wells, back in 2022.

Maria Sakkari vs. Emma Raducanu: Stick a question mark by Raducanu’s name. She pulled out of her match on Sunday with a lingering foot issue, and may or may not be ready for this one. Whoever she faces, Sakkari will be looking to back up her impressive straight-set win over Naomi Osaka in her opener.

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Who’s going to win?

Czechia d. Norway 2-1

Poland d. Germany 2-1

USA d. Spain 3-0

Greece d. Great Britain 3-0