2021: Turned Pro, Grand Slam qualifying debut Kovacevic made his Grand Slam qualifying debut at the
2021 US Open, where he advanced to the final round before falling to Argentine
Marco Trungelliti.
2022: ATP debut, first win and semifinal, Top 200 Kovacevic made his Top 250 debut on July 25, 2022, as world No. 227 following a final showing at the
2022 Indy Challenger. Kovacevic made his ATP main draw debut at the
2022 Korea Open, where he entered as a lucky loser. He recorded his first ATP tour level win by defeating
Miomir Kecmanović in the first round. Next he defeated
Tseng Chun-hsin to reach his first ATP quarterfinal and
Mackenzie McDonald to reach his first ATP semifinal. As a result, he climbed 55 positions and reached No. 167 on October 3, 2022.
2023: First Challenger win, Major and Masters debuts, top 125 Kovacevic reached the top 125 on 6 February 2023, following his first Challenger title at the
2023 Cleveland Open. At the
2023 Delray Beach Open, he received a wildcard for his second ATP tour event, losing in the first round to
Michael Mmoh. In March, he won his second Challenger title at the
2023 Texas Tennis Classic in Waco, Texas as a wildcard. He made his Masters 1000 debut at the
2023 BNP Paribas Open as a wildcard. He reached the main draw at the
2023 Miami Open as a lucky loser and recorded his first Masters win against
Jaume Munar. Kovacevic entered the
2023 U.S. Men's Clay Court Championships as a direct entry. He was accepted as a direct entry at the
2023 French Open, making his Grand Slam debut where he played
Novak Djokovic. He defeated qualifier
Omni Kumar and then world No. 13
Cameron Norrie in the second round of the
2023 Los Cabos Open for the biggest win of his career, to reach the quarterfinals, where he lost to
Dominik Koepfer. Kovacevic qualified at the Masters 1000 at the
2023 Rolex Shanghai Masters on his debut but lost to Chilean
Cristian Garín. He won his third Challenger title at the
2023 Shenzhen Longhua Open, defeating Portuguese
Nuno Borges. He also reached the semifinals at the new
2023 Shenzhen Luohu Challenger but lost after a walkover.
2024: Australian Open debut and first major win, top 75 Kovacevic qualified for the
2024 Australian Open making his debut at this major and recorded his first win in five sets over Chilean
Alejandro Tabilo. As a result, he moved into the top 85 in the singles rankings. Kovacevic entered the
2024 Delray Beach Open as a wildcard and the following week qualified for the
2024 Los Cabos Open where in the latter, he reached back-to-back quarterfinals at this tournament. He also qualified for his first ATP 500 tournament, the
2024 Abierto Mexicano Telcel and defeated Los Cabos champion, Australian
Jordan Thompson. The American also received an invitation for the
2024 BNP Paribas Open. At the next Masters, the
2024 Miami Open, he reached the main draw after qualifying. At the
2024 U.S. Men's Clay Court Championships, he recorded his first victory on clay in 3 hours and 16 minutes, the longest first round and tied for second-longest recorded match in the Houston tournament history, over another Australian,
Thanasi Kokkinakis. In the next round, he met sixth seed Jordan Thompson again, losing in three sets in the longest recorded match in the tournament history lasting 3 hours and 34 minutes, with two tiebreaks in the last two sets. At the ATP 500
Citi DC Open in Washington, he reached the round of 16, defeating Atlanta champion
Yoshihito Nishioka and 11th seed
Roberto Carballés Baena and moved into the top 80 in the rankings on 5 August 2024 and to the top 75 two weeks later.
2025: Two ATP Tour finals, top 60 In January, Kovacevic won the
Oeiras Indoors II Challenger, defeating
Zsombor Piros in the final. He qualified for the main-draw at the
Open Occitanie in
Montpellier, France, and went on to defeat top seed and world No. 10
Andrey Rublev in the last four to reach his first
ATP Tour final, where he lost to Canadian second seed
Félix Auger-Aliassime in a deciding set tiebreak. In July, Kovacevic reached his second
ATP Tour final at the
Los Cabos Open, defeating again top seed and world No. 10 Andrey Rublev in the last four. He lost to another Canadian,
Denis Shapovalov, in the final. As a result, he reached a new career-high ranking of world No. 66 on 21 July 2025. ==Performance timeline==