마로즈산, 파비안

2022: First Challenger title and top 200

He won his first Challenger title in August 2022 in Banja Luka and reached the top 200 at world No. 185 on 29 August 2022.

2023: ATP, Major debut, Masters debut & win over world No. 2 & quarterfinal, top 65

He won his second Challenger in March 2023 in Antalya and moved to a new career high of No. 128 on 20 March 2023.

Ranked No. 135, Marozsán made his ATP and Masters 1000 debut at the 2023 Italian Open after qualifying into the main draw. He won his first Masters level match, defeating Corentin Moutet. In his second round match, he defeated 32nd seed Jiří Lehečka in a third set tiebreaker. He then upset world No. 2 Carlos Alcaraz in straight sets for the biggest win of his career and first top-5 and top-10 win, to reach the fourth round. As a result, he moved 20 positions up to world No. 115 on 22 May 2023. He lost to Borna Ćorić in three sets.

He reached the top 100 on 19 June 2023, after winning the Perugia Challenger title, defeating top seed Pedro Cachin in the semifinals and wildcard Edoardo Lavagno in the final without dropping a set en route.

He made his debut at the 2023 Wimbledon Championships as a lucky loser after the late withdrawal of Nick Kyrgios.

In his second Grand Slam main draw appearance, he reached the second round of the 2023 US Open. In his first round match, he defeated Richard Gasquet in a five sets match where he was originally leading by two sets and a break.

At the 2023 Rolex Shanghai Masters he reached again the fourth round at the Masters level in the season and only twice in his career, defeating Arthur Rinderknech, 11th seed Alex de Minaur and Dušan Lajović for his fourth, fifth and sixth wins at a Masters 1000 level all in straight sets. He became the first Hungarian to reach a quarterfinal at the Masters 1000 level since the series began in 1990 with a top-10 win over Casper Ruud. He lost to 16th seed and eventual champion Hubert Hurkacz in three sets.

He reached another quarterfinal at the 2023 Sofia Open defeating Roberto Bautista Agut coming back from a break down in the third set and converting his fourth match point, before losing to Jan-Lennard Struff.

2024: First Major third round, second Masters quarterfinal, top 40

At the 2024 Australian Open he reached the third round with wins over Marin Čilić and 22nd seed Francisco Cerundolo. At the 2024 BNP Paribas Open he reached the fourth round of a Masters for the third time in his career defeating lucky loser Jurij Rodionov, 24th seed Nicolás Jarry and qualifier Thiago Seyboth Wild. At the 2024 Miami Open he reached again the fourth round of a Masters, this time defeating Aleksandar Kovacevic, upsetting sixth seed Holger Rune, for his third top-10 win, dropping only two games en route in less than one hour, and Alexei Popyrin also in straight sets. He defeated another Australian and top 10 player Alex de Minaur to reach his second Masters quarterfinal. As a result he reached the top 40 in the rankings.