2014: ATP debut Ymer made his ATP main draw singles debut at the
2013 Swedish Open where he lost in the first round to
Grigor Dimitrov. Ymer received a wildcard at the
2014 Swedish Open, defeating
Mikhail Kukushkin in the first round before falling to
João Sousa in the second round.
2015: Qualification at all Grand Slams on debut in one year He qualified to the main of
2015 Australian Open after wins against
Benoît Paire,
Jan Mertl and
Hyeon Chung. He lost in the first round against
Go Soeda in five sets. At the
2015 Barcelona Open Banc Sabadell, Ymer defeated
Thiemo de Bakker and
Nick Kyrgios to reach the third round, where he lost to
David Ferrer. He qualified to the main draw of
2015 French Open after wins against
Roberto Marcora,
Blaž Rola and
Roberto Carballés Baena. He lost in the first round against
Lukáš Rosol in straight sets. Ymer won his first
ATP Challenger title at the 2015
Città di Caltanissetta, beating American
Bjorn Fratangelo in straight sets. Ymer qualified to the main draw of
2015 Wimbledon Championships after wins against
Thomas Fabbiano,
Boy Westerhof and
Guido Pella. He lost in the first round to 23rd seed
Ivo Karlović in four sets. Ymer qualified for all four Grand Slams in 2015 after coming through qualifying at the
2015 US Open. He lost in the first round to
Diego Schwartzman. His finish made him the second man to progress to the main draw of all four majors through qualifying in one year, after
Frank Dancevic in 2011.
2016–2017: Masters debut in singles, Maiden ATP title in doubles He won his maiden title with brother Ymer on home soil at the
2016 Stockholm Open.
2018: First Grand Slam match win Ymer secured a place in the main draw for the
2018 French Open winning three qualifying matches. There he won his first Grand Slam main draw match, beating
Dudi Sela in straight sets.
2022–2024: First ATP semifinal and top-20 win In 2022, he defeated top seed and World No. 15
Aslan Karatsev in straight sets in second round of
2022 Maharashtra Open for his first top-20 win in his career to reach the quarterfinal, only his second since Gstaad in 2016. He went one step further reaching his maiden semifinal by defeating eight seed
Stefano Travaglia. As a result he moved up 20 spots in the rankings back into the top 140 on 7 February 2022. Ranked No. 170 at the
2023 Abierto Mexicano Telcel he reached the main draw as a lucky loser after the withdrawal of
Cameron Norrie and defeated
Adrian Mannarino to reach the second round. As a result he moved 20 positions up back to the top 150. At the
2023 Stockholm Open he reached the quarterfinals as a wildcard defeating
Roberto Bautista Agut and qualifier
Dino Prizmic. Ranked No. 206, he qualified for the
2024 Wimbledon Championships. ==ATP career finals==