Nick Kyrgios drops retirement bombshell after Laver Cup loss

Nick Kyrgios dropped a tennis retirement bombshell after the Australian lost to Stefanos Tsitsipas at the Laver Cup in Boston.

Kyrgios, representing Team World against the Europeans, lost 6-3 6-4 in what was his fifth consecutive singles defeat.

The 26-year-old from Canberra then revealed he might never play another Laver Cup, and hinted his time as a professional tennis player could be coming to an end within a couple of years.

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He also revealed he will travel home to Australia to be with his sick mother once this tournament ends.

"This is my probably my last Laver Cup," Kyrgios said.

"I don't know how much longer I will be in tennis.

"This is my last event of the year. I will get my body right ahead of the Aus Open.

"My mum is not doing too well with her health. I'd like to go back and see her."

Many professional tennis players can compete on the international tour well into their late 30s and even into their 40s.

Kyrgios should have at least a decade left by that measure, but he doesn't sound too keen to stick around much longer.

"As long as I'm on the court, I will try and give my best, but I'm not going to lie and say that I'm going to plan to play four or five more years on tour," he said.

Also in the Laver Cup, Alexander Zverev was pushed to three tiebreakers by American John Isner in the second match of the day session but ultimately prevailed.

Germany's Zverev winning 7-6 (7-5) 6-7 (6-8) 10-5 to give Europe a 7-1 points lead.