Stuttgart 2021 ATP
Final
| Winner | Loser | Score | |
|---|---|---|---|
| Marin Cilic | d. | Felix Auger Aliassime | 7-6(2) 6-3 |
Semifinals
| Winner | Loser | Score | |
|---|---|---|---|
| Felix Auger Aliassime | d. | Sam Querrey | 6-4 7-5 |
| Marin Cilic | d. | Jurij Rodionov | 6-3 1-0 RET |
Quarterfinals
| Winner | Loser | Score | |
|---|---|---|---|
| Sam Querrey | d. | Dominic Stricker | 6-7(4) 7-6(4) 6-3 |
| Felix Auger Aliassime | d. | Ugo Humbert | 7-6(5) 7-6(8) |
| Jurij Rodionov | d. | Alex De Minaur | 3-6 6-3 7-6(4) |
| Marin Cilic | d. | Denis Shapovalov | 7-5 7-6(3) |
Round of 16
| Winner | Loser | Score | |
|---|---|---|---|
| Dominic Stricker | d. | Hubert Hurkacz | 7-6(5) 7-6(5) |
| Sam Querrey | d. | James Duckworth | 6-4 7-6(7) |
| Felix Auger Aliassime | d. | Lloyd Harris | 6-3 7-6(4) |
| Ugo Humbert | d. | Yannick Hanfmann | 7-6(9) 6-2 |
| Jurij Rodionov | d. | Peter Gojowczyk | 5-3 RET |
| Alex De Minaur | d. | Jordan Thompson | 6-7(8) 6-3 6-4 |
| Marin Cilic | d. | Nikoloz Basilashvili | 6-3 6-2 |
| Denis Shapovalov | d. | Feliciano Lopez | 6-2 6-7(2) 6-3 |
Round of 32
| Winner | Loser | Score | |
|---|---|---|---|
| Dominic Stricker | d. | Radu Albot | 7-6(4) 7-6(5) |
| Sam Querrey | d. | Altug Celikbilek | 6-4 6-1 |
| James Duckworth | d. | Adrian Mannarino | 6-3 6-2 |
| Lloyd Harris | d. | Gilles Simon | 6-4 7-5 |
| Yannick Hanfmann | d. | Jeremy Chardy | 6-4 6-4 |
| Ugo Humbert | d. | Marton Fucsovics | 6-3 6-1 |
| Peter Gojowczyk | d. | Ilya Ivashka | 5-7 6-4 6-2 |
| Jurij Rodionov | d. | Dominik Koepfer | 2-6 6-3 6-2 |
| Jordan Thompson | d. | Guido Pella | 6-3 6-4 |
| Nikoloz Basilashvili | d. | Dustin Brown | 6-3 7-6(4) |
| Marin Cilic | d. | Rudolf Molleker | 7-5 6-3 |
| Feliciano Lopez | d. | Alexei Popyrin | 6-4 6-4 |
Qualifying round 2
| Winner | Loser | Score | |
|---|---|---|---|
| Radu Albot | d. | Emil Ruusuvuori | 7-6(5) 6-4 |
| Altug Celikbilek | d. | Dennis Novak | 1-6 7-6(3) 7-5 |
| Peter Gojowczyk | d. | Gregoire Barrere | 6-2 6-4 |
| James Duckworth | d. | Ilya Ivashka | 7-6(5) 3-6 7-5 |
Qualifying round 1
| Winner | Loser | Score | |
|---|---|---|---|
| Radu Albot | d. | Christopher Oconnell | 6-3 0-0 RET |
| Emil Ruusuvuori | d. | Joao Sousa | 7-5 6-3 |
| Altug Celikbilek | d. | Lucas Pouille | 6-3 2-6 6-3 |
| Dennis Novak | d. | Jiri Vesely | 6-7(5) 6-2 6-4 |
| Gregoire Barrere | d. | Marcos Giron | 6-3 6-2 |
| Peter Gojowczyk | d. | Sergiy Stakhovsky | 6-1 7-6(4) |
| Ilya Ivashka | d. | Daniel Masur | 6-0 7-6(4) |
| James Duckworth | d. | Luke Saville | 6-7(6) 6-4 6-4 |