That success from the 18-year-old came after he stunned Andrey Rublev at the Australian Open last month.

And that shock was only just after Fonseca won the NextGen ATP Finals title in Jeddah at the end of 2025.

The Brazilian teenager now finds himself among the top 100 players in the world, but he isn’t the only rising star to have been impressing in recent times.

Future ATP star Learner Tien can be America’s Joao Fonseca

His fellow 2024 NextGen ATP aces Arthur Fils and Jakub Mensik are also heading for very bright futures, and currently sit 19th and 54th in the rankings respectively.

Fonseca meanwhile occupies 78th place, but sitting just five places behind him is 19-year-old Learner Tien, with the former having beaten the latter for the NextGen title.

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The American teenager also recorded a huge shock in Melbourne last month, knocking out 2024 runner-up and world number five at the time Daniil Medvedev.

Tien has only just picked up another top 10 win, defeating top seed Alexander Zverev in the Mexican Open round of 16.

Tennis legend Jimmy Connors wants more American talent to emerge amid the rise of Fonseca, but it looks like Tien is quickly answering that call, or is at least capable of doing so.

America will be desperate for men’s Grand Slam champion as women impress

Mentioning Tien’s name with a Grand Slam title is undoubtedly premature, but he does have a fantastic chance of creating more headlines at Indian Wells.

He will make his debut at the ATP 1000 tournament next month, where both Tien and Fonseca have been handed wildcards.

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It is also worth remembering that Tien isn’t the only American man making waves in 2025, with his compatriot Alex Michelsen also shining brightly.

The 20-year-old is already up to 34th in the world rankings, and like Fonseca and Tien caused a huge upset in Australia with his win over Stefanos Tsitsipas.

The future of American women’s tennis meanwhile is also in safe hands, with four such players in the WTA top 10, and three in the top five.

Moreover, Madison Keys lifted the Australian Open trophy last month, with 23-year-old Amanda Animisova winning the Qatar Open not long after.

But unlike the situation with the women impressing of late, America will be desperate for a men’s Grand Slam champion.

In a simply extraordinary and somewhat unforgivable scenario, Andy Roddick is the last man to achieve that feat with his 2003 US Open win.