Pablo Carreno Busta is one of the toughest players on the ATP Tour, winning multiple five-set matches at this year's US Open. The Spaniard is gritting his teeth and pushing past anyone who stands across the net, though he got through Novak Djokovic via default.

The tennis world knows the 29-year-old relatively well since his quarterfinal and semifinal runs at the French Open and US Open's in 2017. Carreno Busta keeps pushing past limits, reaching the second major semifinal of his career, earning at least $800,000 and the No. 18 ranking.

Here are five things to know about the Spaniard.

1

In August 2015, Carreno Busta captured his first ATP singles title at the Winston-Salem Open, beating fellow Spaniard Roberto Bautista Agut in the final. It was his second ATP final of that year having reached the Estoril final in April where he lost to Benoit Paire. The success sent him into the Top 40 for the first time.

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2

Carreno Busta is familiar with the semifinal spotlight in New York. In 2017, the then 26-year-old dropped no sets on the way through to his career-high run, beating Diego Schwartzman in the quarterfinals. This put him in the Top 10 for the first time.

3

Just like many other Spaniards on tour, Carreno Busta has a passionate side that has gotten him into trouble on the court. At the 2019 Australian Open, Busta refused to shake the umpire's hand after losing a five-hour marathon match against Kei Nishikori in the fourth round, arguing about a late call from a linesperson. Carreno Busta then threw his bag onto the court before leaving in front of a booing crowd.

He knew what he had done wrong and immediately apologized in the post-match conference.

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4

Last year, Carreno Busta helped Spain win the country's sixth Davis Cup title, with Rafael Nadal deservedly being named that year's MVP. This was world No. 27's fourth consecutive Davis Cup appearance and he currently holds a 3-5 record.

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5

While on the singles side Carreno Busta has earned four singles titles, none of them have come from anything but ATP 250 tournaments. However, on the doubles side, he is the proud owner of the 2017 US Open runner-up trophy and this year's Cincinnati crown. The former came with his fellow Spaniard, Guillermo Garcia-Lopez, and the latter with Alex de Minaur.

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Carreno Busta is ready to take on first-time US Open semifinalist Alexander Zverev on Friday. The pair have only met once before, back in 2018 at the Miami Masters semifinals; Zverev won the battle in straight sets.