Frances Tiafoe says people used to "clown" him for believing he would become a pro tennis player, but adds he is now the last one laughing. 

The American tennis star, whose parents immigrated from Sierra Leone to the United States in the 1990s to escape the civil war that was happening at the time, celebrated his 27th birthday in January. 

At 27, Tiafoe has achieved some notable stuff and he has been regularly participating in the main-level tournaments for several years now. In his collection, the current world No. 12 has three ATP titles and he is also a two-time Grand Slam semifinalist. Also, he knows how it feels to be a top-10 player, having achieved a career-high ranking of No. 10 in mid-2023.

While Tiafoe has been one of the faces of American men's tennis for the past couple of years, he was once heavily doubted. 

Tiafoe: People wouldn't take me seriously when I'd tell them I wanted to be a pro

“I’d tell guys from the [club] that I’d want to be a pro. They would just clown and not take it seriously. I was always like: ‘Don’t worry, man. I’m going to be the last person laughing.’ Here we are today," the 2022 and 2024 US Open semifinalist told The Guardian.

As mentioned above, Tiafoe has a solid resume and he has proven capable of doing some nice things. However, the world No. 12 believes the best is yet to come and that he will pull off much better accomplishments before he retires.

“I’m still young – I’ve still got a lot more to achieve. I still haven’t scratched the surface of my career," the American said.

Currently, Tiafoe is competing at the Cincinnati Masters, where he plays Ugo Humbert in the third round. Last year, the 27-year-old came close to winning the biggest title of his career in Cincinnati before losing to Jannik Sinner in the final.

Tiafoe is certainly hoping to go a step further this year and lift his maiden Masters title in Cincy.