Gojowczyk began the year by reaching his first tour-level semifinal at Doha as a qualifier, defeating sixth seed and countryman Philipp Kohlschreiber en route, before losing to Rafael Nadal in three sets (taking the first).

[2] In April, he defeated Jo-Wilfried Tsonga in five sets in a Davis Cup World Group quarterfinal tie.

In September, he won his maiden ATP title at the Moselle Open in Metz as a qualifier, defeating Benoît Paire in straight sets in the final.

As a lucky loser he reached the semifinals of the 2019 Washington Open losing to third seed Daniil Medvedev.

[5] At the 2020 Australian Open, he qualified and reached the second round for the second time at this Major defeating Christopher Eubanks.

[6] He reached beyond the second round of a Grand Slam for the first time in his career defeating 23rd seed Ugo Humbert and Dušan Lajović both matches in five sets.

[7] He went on to reach the fourth round of a Major for the first time in his career defeating fellow qualifier Henri Laaksonen in four sets.

Gojowcyk announced his retirement from professional tennis on 5 November 2023, after losing in the first qualifying round of the Moselle Open, the place where he won his only title on the ATP Tour.

His backhand is particularly solid in terms of relative groundstroke quality, opting for frequent injections of pace, whilst not shying away from the down-the-line shot.