Daniel Altmaier, a German tennis player, has had a mix of successes in his ATP Tour career since debuting in 2014. He broke into the top 50 of the ATP rankings at the start of the 2026 season, following a standout performance in 2025, which included his best results at the Australian Open, Roland Garros, and the US Open.
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Altmaier has recorded notable victories against top players, including Jannik Sinner, who he defeated at the 2023 Roland Garros, as well as wins over Andrey Rublev, Alexander Zverev, and Casper Ruud. This year, he eliminated Ben Shelton from the second round of the Hamburg Open and Daniil Medvedev at the Halle Open.
However, 2026 has been less favorable for Altmaier at the Grand Slam level. He is one of six players who did not achieve a Grand Slam victory this year, alongside Tallon Griekspoor, Giovanni Mpetshi Perricard, Aleksandar Kovacevic, Terence Atmane, and Aleksandar Vukic.
Altmaier's Grand Slam journey in 2026 began with a first-round loss to Marin Cilic at the Australian Open. At Roland Garros, he faced Felix Auger-Aliassime, again exiting in the first round after a five-set match that included a closely contested tie-break in the final set.
Despite showing promise with a semi-final appearance at the Halle Open, Altmaier was eliminated in the first round of Wimbledon by Alex Molcan. He ended his disappointing Grand Slam run after losing to Zachary Svadja in the opening round of the US Open.
In total, Altmaier won only four sets across his four Grand Slam matches this year, a stark contrast to his previous years where he reached the fourth round of Grand Slams twice at Roland Garros. Due to this performance slump, he has dropped out of the ATP Tour top 50 and currently ranks at No. 67.