Alexander Zverev crashed out of the Argentina Open Alexander Zverev crashed out of the Argentina Open

Alexander Zverev and Taylor Fritz were stunned in Buenos Aires and Florida respectively as they crashed out of ATP 250 tournaments on Friday. (More Tennis News)

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Zverev, the world number two, was the top seed at the Argentina Open, yet came unstuck in the quarter-finals.

Francisco Cerundolo came from a set down to win 3-6 6-3 6-2, leaving Zverev to lick his wounds in his first tournament since his run to the Australian Open final.

Zverev, however, was unhappy with how he was treated by the Argentine crowd.

"The only problem is that the public doesn't know how to behave during a tennis match, and that's a bit sad because the tournament is excellent," he said.

"The crowd makes it very difficult for you if you're not Argentine."

Cerundolo will take on Pedro Martinez, who received a walkover against Lorenzo Musetti.

The other semi-final will see ATP Next Gen Finals champion Joao Fonseca take on Laslo Djere.

18, 177 - Excluding the ATP NextGen Finals, Joao Fonseca (18y 177d) is now the youngest South American to reach an ATP event semi-final since Juan Martin del Potro - 18y 104d, Adelaide 2007. Rolling.#IEBMasArgOpen2025 | @ArgentinaOpen @atptour @ATPMediaInfo pic.twitter.com/VXsV0vYVBo

— OptaAce (@OptaAce) February 15, 2025

Fonseca claimed a superb 3-6 6-4 7-5 triumph over fan favourite Mariano Navone, saving two match points in the process.

Excluding the Next Gen Finals,ff777 slot Fonseca, at the age of 18 years and 177 days, is the youngest South American to reach a Tour-level event semi-final since Juan Martin del Potro (18 years, 104 days) in Adelaide in 2007.

"Those are the victories that we work for," said the Brazilian. 

"I was not playing my best and I fought until the end. Since the beginning I believed I could win, even if I wasn’t playing my best, but I fought. I feel amazing."

"Yes, definitely, the mental toughness of this side is totally different. We are a united bunch and we backed each other and motivated each other when chips were down," Harmanpreet told PTI after returning to the country on Saturday.

There was also a big shock at the Delray Beach Open, where two-time reigning champion Fritz lost 7-6 (7-4) 7-6 (7-5) to Alejandro Davidovich Fokina.

Impressive from start to finish @alexdavidovich1 knocks out the 2x defending champ 7-6(4) 7-6(5).@DelrayBeachOpen | #DBOpen pic.twitter.com/ooOSIntHF3

— ATP Tour (@atptour) February 15, 2025

The world number four broke Fokina when the Spaniard was serving for the match to force the tie-break, but Fritz could not keep up that momentum as his hopes of a three-peat were dashed.

Alex Michelsen will be the United States' only representative in the last four in Florida after he downed Cameron Norrie 7-6 (7-3) 7-5swerteplay, gaining a measure of revenge for a defeat to the Brit in Dallas last week.