Großer Preis der USA 2021 / Austin
3. Training
| Pos. | Nr. | Fahrer | Team | Zeit | Rückstand | Rdn. |
|---|---|---|---|---|---|---|
| 1 | 11 |  | Red Bull | 1.34.701 | --- | 13 |
| 2 | 55 | | Ferrari | 1.34.805 | + 0.104 | 16 |
| 3 | 33 | | Red Bull | 1.34.912 | + 0.211 | 13 |
| | ||||||
| 4 | 4 | | McLaren | 1.34.945 | + 0.244 | 13 |
| 5 | 77 | | Mercedes | 1.34.988 | + 0.287 | 15 |
| 6 | 44 | | Mercedes | 1.35.219 | + 0.518 | 16 |
| 7 | 3 | | McLaren | 1.35.345 | + 0.644 | 11 |
| 8 | 10 | | AlphaTauri | 1.35.398 | + 0.697 | 17 |
| 9 | 16 | | Ferrari | 1.35.688 | + 0.987 | 17 |
| 10 | 31 | | Alpine | 1.35.711 | + 1.010 | 10 |
| 11 | 5 | | Aston Martin | 1.35.851 | + 1.150 | 18 |
| 12 | 63 | | Williams | 1.36.023 | + 1.322 | 9 |
| 13 | 7 | | Alfa Romeo | 1.36.062 | + 1.361 | 20 |
| 14 | 6 | | Williams | 1.36.118 | + 1.417 | 8 |
| 15 | 99 | | Alfa Romeo | 1.36.252 | + 1.551 | 16 |
| 16 | 18 | | Aston Martin | 1.36.392 | + 1.691 | 13 |
| 17 | 14 | | Alpine | 1.36.490 | + 1.789 | 12 |
| 18 | 22 | | AlphaTauri | 1.36.572 | + 1.871 | 16 |
| 19 | 47 | | Haas F1 | 1.36.671 | + 1.970 | 15 |
| 20 | 9 | | Haas F1 | 2.03.456 | + 28.755 | 15 |
