Sebastian Korda, the son of 1998 men's singles champion Petr Korda, won the boys' singles tennis title at the 2018 Australian Open, defeating Tseng Chun-hsin in the final, 7–6(8–6), 6–4.
Tseng Chun-hsin won the boys' singles tennis title at the 2018 French Open, defeating Sebastián Báez in the final, 7–6(7–5), 6–2.
Tseng Chun-hsin won the title, defeating Jack Draper in the final, 6–1, 6–7(2–7), 6–4.
Wu Yibing was the defending champion, but was no longer eligible to participate in junior tournaments.
Holger Rune won the boys' singles tennis title at the 2019 French Open, defeating Toby Kodat in the final, 6–3, 6–7(5–7), 6–0.
Nicolás Jarry was the reigning champion from when the tournament was last held in 2019, but chose to not defend his title.
Alexander Zverev defeated Andrey Rublev in the final, 6–2, 6–3 to win the men's singles tennis title at the 2021 Cincinnati Masters. It was his fifth Masters 1000 title and 17th career singles title on the ATP Tour.
Novak Djokovic defeated the defending champion Daniil Medvedev in the final, 4–6, 6–3, 6–3 to win the singles tennis title at the 2021 Paris Masters. It was his record-extending sixth Paris Masters title and record-breaking 37th ATP Tour Masters 1000 title overall, surpassing Rafael Nadal's tally in the latter category.
João Sousa defeated Emil Ruusuvuori in the final, 7–6(11–9), 4–6, 6–1 to win the singles title at the 2022 Tata Open Maharashtra. Sousa saved three match points against Elias Ymer in the semifinals. This was his first title since 2018.
Tallon Griekspoor was the defending champion but chose not to defend his title.
Jannik Sinner defeated the defending champion Carlos Alcaraz in the final, 6–7(5–7), 6–1, 6–1 to win the singles tennis title at the 2022 Croatia Open Umag.
Kwon Soon-woo was the defending champion but chose not to defend his title.
Andrey Rublev defeated Sebastian Korda in the final, 6–2, 6–3 to win the singles tennis title at the 2022 Gijón Open. It was his 12th ATP Tour singles title.
Defending champion Carlos Alcaraz defeated Stefanos Tsitsipas in the final, 6–3, 6–4 to win the singles tennis title at the 2023 Barcelona Open. He did not lose a single set in the entire tournament.
Daniil Medvedev defeated Holger Rune in the final, 7–5, 7–5 to win the men's singles tennis title at the 2023 Italian Open. It was his fifth title of 2023, sixth career Masters 1000 title, and first ATP Tour title on clay. Before 2023, Medvedev had never won a match at the Italian Open in three previous appearances.
Carlos Alcaraz defeated Alex de Minaur in the final, 6–4, 6–4 to win the singles tennis title at the 2023 Queen's Club Championships. By winning the title, Alcaraz reclaimed the ATP no. 1 singles ranking from Novak Djokovic. It was his first title on grass.
Francisco Comesaña was the defending champion but chose not to defend his title.
The 2024 Croatia Open was a men's tennis tournament played on outdoor clay courts. It was the 34th edition of the Croatia Open, and an ATP 250 tournament on the 2024 ATP Tour. It took place at the International Tennis Center in Umag, Croatia, from 21 through 27 July 2024.
Arthur Fils defeated defending champion Alexander Zverev in the final, 6–3, 3–6, 7–6(7–1) to win the men's singles tennis title at the 2024 Hamburg Open. It was his second ATP Tour title and first ATP 500 title.
Alexei Popyrin defeated Andrey Rublev in the final, 6–2, 6–4 to win the men's singles tennis title at the 2024 Canadian Open. It was his first Masters 1000 title and third career ATP Tour title. Popyrin saved three match points en route to the title, in his third-round match against Grigor Dimitrov. He became the first Australian player to win a Masters title since Lleyton Hewitt in 2003 at Indian Wells. Ranked No. 62, Popyrin was the second lowest-ranked men's singles champion at the Canadian Open, after Mikael Pernfors in 1993, and the lowest-ranked finalist since Harel Levy in 2000.
Francisco Cerúndolo 
Lorenzo Musetti 
