The 29-year-old hasn't tasted a lot of success in those years; after all, he's only won the 1 singles title and no doubles titles.
Tiafoe made his pro debut in 2015, finishing the year as world No. 180 and the youngest guy in the ATP Top 200 rankings.
Harris has three ATP Challenger singles and two Challenger doubles trophies, as well as 13 ITF singles and four ITF doubles titles.
Fognini’s game-play is best suited to red clay courts, which is where he has tasted most of his success.
Alcaraz has won three ITF Men's World Tennis Tour titles and four ATP Challenger Tour titles since turning professional in 2018.
Amazingly, he won his first-ever match on tour - and that win came against an established name in Pablo Carreno Busta.