| Date: | 20–27 September |
| Edition: | 114th |
| Surface: | Clay / Outdoor |
| Category: | ATP Tour 500 |
| Location: | Hamburg, Germany |
| Venue: | Am Rothenbaum |
| Champs: |  Andrey Rublev |
| Champd: |  John Peers /  Michael Venus |
| Main Name: | German Open Tennis Championships |
The 2020 Hamburg European Open was a men's tennis tournament played on outdoor red clay courts. It was the 114th edition of the German Open Tennis Championships and part of the ATP Tour 500 series of the 2020 ATP Tour (called the Hamburg Open). Originally scheduled for 13 to 19 July 2020, but due to the ongoing COVID-19 pandemic, it was rescheduled from 20 to 27 September 2020 and took place at the Am Rothenbaum in Hamburg, Germany.[1]
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles[2] | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | 45 | 25 | 0 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| style=background:#ededed | Singles | €354,845 | €178,220 | €89,925 | €47,260 | €23,620 | €13,065 | €5,025 | €2,515 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#ededed | Doubles | €111,490 | €54,570 | €27,370 | €14,040 | €7,260 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Russian Federation | Daniil Medvedev | 5 | 1 | |
| Stefanos Tsitsipas | 6 | 2 | ||
 France | Gaël Monfils | 9 | 3 | |
 Spain | Roberto Bautista Agut | 10 | 4 | |
| Russian Federation | Andrey Rublev | 12 | 5 | |
 Italy | Fabio Fognini | 13 | 6 | |
 Argentina | ||||
| Russian Federation | Karen Khachanov | 16 | 8 |
The following players received wildcards into the main draw:
The following player received entry as a special exempt into the main draw:
The following player used a protected ranking into the main draw:
The following players received entry from the qualifying draw:
The following players received entry as a lucky loser:
Matteo Berrettini → replaced by Ugo Humbert Pablo Carreño Busta → replaced by 
Casper Ruud Alex de Minaur → replaced by Jan-Lennard Struff
David Goffin → replaced by Albert Ramos Viñolas
Hubert Hurkacz → replaced by Lorenzo Sonego
John Isner → replaced by Adrian Mannarino Diego Schwartzman → replaced by 
Alexander Bublik
Denis Shapovalov → replaced by Gilles Simon Benoît Paire (COVID-19)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Juan Sebastián Cabal |  Colombia | Robert Farah | 3 | 1 | ||
| Rajeev Ram |  United Kingdom | Joe Salisbury | 11 | 2 | ||
| Poland | Łukasz Kubot |  Brazil | Marcelo Melo | 14 | 3 | |
| Spain | Argentina |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
The following pair received entry as lucky losers:
Marcel Granollers / Horacio Zeballos → replaced by Marvin Möller / Milan Welte Robert Farah / Juan Sebastián Cabal (COVID-19 reasons)See main article: 2020 Hamburg European Open – Singles.
Andrey Rublev def. Stefanos Tsitsipas, 6–4, 3–6, 7–5See main article: 2020 Hamburg European Open – Doubles.
John Peers / Michael Venus def. Ivan Dodig / Mate Pavić, 6–3, 6–4
