36 in singles by the Association of Tennis Professionals (ATP), which he achieved on 27 June 2022, and has a career-high doubles ranking of world No.

After several years of failing to qualify for most Grand Slam tournaments, he produced consistency in 2021 by entering into three consecutive main draws and showed his best performance at a major at the 2021 US Open, where he upset 20th seed Lorenzo Sonego in the first round and ultimately reached the fourth round.

Otte made a remarkable run at the Qingdao Challenger, where he reached the final both in the singles (as a qualifier) and in the doubles tournament.

[1] He won his first ATP Challenger Tour doubles title at the Garden Open in Rome, partnering Andreas Mies.

[2] He won his first singles match on the ATP Tour at the Stockholm Open, defeating Jürgen Zopp in the first round.

Otte qualified again for the main draw at the 2019 French Open as a lucky loser and reached the second round by defeating Malek Jaziri.

[4] In the first round, Otte won only the second-ever fifth-set 12–12 singles tiebreak since that rule was implemented in 2019, defeating fellow qualifier Arthur Rinderknech 4–6, 6–3, 6–2, 6–7(5–7), 13–12(7–2) in almost 4 hours over two days.

Ranked 96 at the Australian Open, he recorded his first victory at this major by defeating wildcard Tseng Chun-hsin in the first round.

Entering the main draw as a lucky loser, he lost in the first round to qualifier Emil Ruusuvuori.

[21] At the Serbia Open, he upset fourth seed and last year finalist, Aslan Karatsev, in the second round.

[24] He defeated lucky loser, Alejandro Tabilo, in the quarterfinals to reach his first ATP Tour-level semifinal.

[25] He fell in his semifinal match to wildcard Holger Rune, who would end up winning the tournament.

[30] As a result of his Stuttgart run, Otte received a Special Exempt into the Halle Open.

There on his debut, he defeated Miomir Kecmanović and Nikoloz Basilashvili to reach the quarterfinals of an ATP 500 tournament for the first time in his career.

At Wimbledon, he reached the third round for the first time in his career and lost to rising star, fifth seed, and world No.

[43] Otte reached his first final on the ATP Tour in the doubles draw of the Sofia Open, partnering Fabian Fallert.

Otte qualified for the 2023 Wimbledon Championships and defeated compatriot Dominik Koepfer before losing to Daniel Elahi Galán in the second round.