Daniel Altmaier needs five hours and 26 minutes to upset Jannik Sinner in the second round at Roland Garros.

Daniel Altmaier in second-round action against Jannik Sinner on Thursday at Roland Garros.

Daniel Altmaier competes against Aslan Karatsev on Wednesday in Munich.

Daniel Altmaier is the champion in Guayaquil, claiming his third ATP Challenger title of 2022.

Daniel Altmaier is the champion in Lima, claiming his fifth ATP Challenger title.

Daniel Altmaier is the champion on home soil in Heilbronn, claiming his first title of 2022.

Daniel Altmaier lost to Thiago Monteiro on Monday in the Adelaide first round.

Daniel Altmaier is the champion in Puerto Vallarta, claiming his third ATP Challenger title of 2021.

Daniel Altmaier is the champion in Puerto Vallarta, claiming his third ATP Challenger title of 2021.

Daniel Altmaier advances to the second round with a straight-sets win over Sam Querrey.

Daniel Altmaier is the champion on home soil in Luedenscheid, claiming his second ATP Challenger title of 2021.

Daniel Altmaier celebrates his maiden ATP Challenger title in Braunschweig, Germany.

Daniel Altmaier celebrates his maiden ATP Challenger title in Braunschweig, Germany.

Daniel Altmaier is making his Grand Slam debut at Roland Garros.

Daniel Altmaier records the biggest win of his career over seventh seed Matteo Berrettini on Saturday at Roland Garros.

Daniel Altmaier overcomes seventh seed Matteo Berrettini on Saturday for a place in the Roland Garros fourth round.

Daniel Altmaier reaches the third round at Roland Garros in his Grand Slam debut.

#NextGenATP German Daniel Altmaier is through to the second round in Antalya.

Qualifier Daniel Altmaier was scheduled to play his first round on Monday.

Daniel Altmaier moves into the Round of 16 at the Todi Challenger.