2021 Halle Open
The 2021 Halle Open was a men's tennis tournament played on outdoor grass courts. It was the 28th edition of the Halle Open and part of the ATP Tour 500 series of the 2021 ATP Tour. It took place at the OWL Arena in Halle, Germany, between 14 June and 20 June 2021. Unseeded Ugo Humbert won the singles title.
Finals
Singles
- Ugo Humbert defeated Andrey Rublev, 6–3, 7–6
Doubles
- Kevin Krawietz / Horia Tecău'defeated Félix Auger-Aliassime / Hubert Hurkacz, 7–6, 6–4
Points and prize money
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | €113,785 | €84,075 | €59,860 | €40,765 | €25,480 | €14,650 | €6,750 | €3,565 |
| Doubles* | €40,200 | €30,240 | €21,760 | €14,340 | €9,020 | €5,000 |
*per team
ATP singles main-draw entrants
Seeds
Other entrants
The following players received wildcards into the main draw:The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
;Before the tournament- Pablo Carreño Busta → replaced by Corentin Moutet
- Cristian Garín → replaced by Gilles Simon
- Casper Ruud → replaced by Sam Querrey
- Stefanos Tsitsipas → replaced by Yannick Hanfmann
ATP doubles main-draw entrants
Seeds
Other entrants
The following pairs received wildcards into the doubles main draw:- Daniel Altmaier / Dominic Stricker
- Dustin Brown / Jan-Lennard Struff
Petros Tsitsipas / Stefanos Tsitsipas
The following pair received entry as a lucky loser:
Withdrawals
;Before the tournament- Marcel Granollers / Horacio Zeballos → replaced by Andrés Molteni / Guido Pella
- Łukasz Kubot / Marcelo Melo → replaced by Łukasz Kubot / Édouard Roger-Vasselin
- Petros Tsitsipas / Stefanos Tsitsipas → replaced by Yannick Hanfmann / Dominik Koepfer