He won the 2015 French Open boys' singles title by defeating fellow American Taylor Fritz in the final in three sets.

In April, Paul was awarded a wild card into the 2016 U.S. Men's Clay Court Championships at Houston, and defeated 53rd-ranked Paolo Lorenzi in the first round for his first career ATP level win.

He then played Lucas Pouille and achieved the biggest win of his career, defeating the Frenchman in straight sets.

In the next round, he faced Gilles Müller again, but this time came out on top in three sets to reach his first ATP 500 quarterfinal.

[4] In September, Paul broke into the top 100 for the first time in his career having won his second ATP Challenger title of the year in New Haven, after winning in Sarasota earlier in the season.

80 at the Australian Open, Paul reached the third round of a Grand Slam for the first time in his career by beating 18th seed and world No.

[16] Getting past qualifying at the Italian Open, he lost in the first round to tenth seed Roberto Bautista Agut.

[17] Seeded sixth at the first edition of the Emilia-Romagna Open in Parma, Italy, he reached the semifinals where he lost to Sebastian Korda.

[18] Ranked 52 at the French Open, he beat Christopher O'Connell in a first-round five-set thriller[19] before he lost in the second round to world No.

[23] Getting past qualifying at the Canadian Open in Toronto, he was defeated in the second round by tenth seed Roberto Bautista Agut.

Making it through qualifying at the Western & Southern Open in Cincinnati, he beat 16th seed, Cristian Garín, in the first round.

[26] At the Indian Wells Masters, he recorded one of the biggest wins of his career, defeating fourth seed and world No.

[28] At the Kremlin Cup in Moscow, he lost in the second round to sixth seed and eventual finalist, Marin Čilić.

He reached the first ATP final of his career, defeating fifth seed, Taylor Fritz, in the second round,[32] former world No.

1 and three-time Grand Slam champion, Andy Murray, in the quarterfinals,[33] and eighth seed, Frances Tiafoe, in the semifinals.

[41] Representing the U.S. in the Davis Cup tie against Colombia, Paul played one match and won over Nicolás Mejía.

Seeded seventh, he lost in the first round to compatriot Brandon Nakashima in a match that consisted of three tiebreakers.

[68] Seeded 29th at the 2022 US Open, he reached the third round for the first time at this Major after defeating Bernabé Zapata Miralles and compatriot Sebastian Korda both in five sets matches, the latter lasting over three hours.

2 Rafael Nadal in the second round the 2022 Rolex Paris Masters, his fourth Top-10 victory of the year, recovering from a set and a break down and denying him the No.

At the US Open he reached the fourth round at this Major for the first time defeating 21st seed Alejandro Davidovich Fokina.

He reached back-to-back finals at the 2024 Delray Beach Open defeating second seed Frances Tiafoe.

[83][84] Having never been past the fourth round at the Masters 2024 BNP Paribas Open, he reached the semifinals at this tournament for the first time and only the second in his career at this level, with wins over fellow American Alex Michelsen, 14th seed Ugo Humbert, lucky loser Luca Nardi[85] and ninth seed Casper Ruud.

[86] At the 2024 Miami Open he lost in the second round to wild card Martin Damm Jr. after retiring with an injury, having received a bye at the tournament.

[87] At the next Masters, the 2024 Italian Open, he reached the semifinals for the first time at this tournament, having never advanced past the second round previously.

[88] It was also the first time multiple American players (with Taylor Fritz) reached the quarterfinals in singles in Rome since 2008.

[90][91] Seeded fifth, he reached his sixth ATP career final at the 2024 Queen's Club Championships, and second on grass with wins over Sebastián Báez, Alejandro Tabilo, Jack Draper[92] and Sebastian Korda.

[94][95] Seeded third, he reached the Paris Olympics semifinals with Taylor Fritz, and won the bronze medal defeating the duo from Czechia, Tomáš Macháč and Adam Pavlásek.

[96] Tommy started the 2025 season off as the top seed at the 2025 Adelaide International where he reached the semifinals, losing to Felix Auger-Aliassime in three sets.

Tommy began his title defense of the 2025 Dallas Open with three straight wins over fellow Americans Jenson Brooksby, Ethan Quinn, and Reilly Opelka before losing in the semifinals to Denis Shapovalov.

Paul possesses a strong attacking forehand and solid footwork along the baseline and speed coming into net, attributes that have allowed him success on clay surfaces.