Sergio Perez has gone fastest in the opening practice session for this weekend’s Formula 1 Monaco Grand Prix.
It was a confidence-building performance from the Mexican who headed Carlos Sainz (Ferrari) and Max Verstappen (Red Bull).
Perez used a set of soft compound tyres, as did fourth-best Pierre Gasly (AlphaTauri), with most others opting for the medium rubber.
It was a short session for Charles Leclerc, the Ferrari driver logging just four laps before suffering a terminal gearbox issue.
Across the garage, Sainz proved competitive throughout, spending much of the session towards the top of the timesheets.
That was helped by finding free air on a track busy with traffic, allowing the Spaniard to build up his confidence in the car early.
His best of 1:12.606s used a set of medium compound tyres, whereas Perez used a set of softs to bank his 1:12.536s.
Fernando Alonso had an interrupted session, knocking the front wing off his Alpine as he rounded the final corner.
Another mistake later in the session saw him run long at Ste Devote as the two-time Monaco Grand Prix winner ended the session 13th fastest.
It was a busy session with every driver, aside from the aforementioned Leclerc, logging nearly 30 laps in the 60-minute session.
Antonio Giovinazzi set the fewest with just 27, while Nicholas Latifi logged 40 at Williams.
McLaren used the session like a test, with Daniel Ricciardo completing 36 laps to end proceedings 15th best, his 1:14.281s a full second down on team-mate Lando Norris in seventh.
Lewis Hamilton was just fifth fastest, 0.5s off Perez’s pace, with Valtteri Bottas 0.2s further back in sixth.
Rounding out the top 10 were Sebastian Vettel (Aston Martin) in eighth, Yuki Tsunoda (AlphaTauri), and Kimi Raikkonen (Alfa Romeo).
Free Practice 2, another 60-minute session, follows at 23:00 AEST.
Results: Formula 1 Monaco Grand Prix, Free Practice 1
| POS | NO | DRIVER | CAR | TIME | GAP | LAPS |
| 1 | 11 | Sergio Perez | RED BULL RACING HONDA | 01:12.5 | 36 | |
| 2 | 55 | Carlos Sainz | FERRARI | 01:12.6 | +0.119s | 32 |
| 3 | 33 | Max Verstappen | RED BULL RACING HONDA | 01:12.6 | +0.161s | 39 |
| 4 | 10 | Pierre Gasly | ALPHATAURI HONDA | 01:12.9 | +0.442s | 37 |
| 5 | 44 | Lewis Hamilton | MERCEDES | 01:13.0 | +0.508s | 34 |
| 6 | 77 | Valtteri Bottas | MERCEDES | 01:13.1 | +0.644s | 36 |
| 7 | 4 | Lando Norris | MCLAREN MERCEDES | 01:13.2 | +0.749s | 31 |
| 8 | 5 | Sebastian Vettel | ASTON MARTIN MERCEDES | 01:13.7 | +1.245s | 33 |
| 9 | 22 | Yuki Tsunoda | ALPHATAURI HONDA | 01:13.7 | +1.259s | 39 |
| 10 | 7 | Kimi Räikkönen | ALFA ROMEO RACING FERRARI | 01:14.1 | +1.594s | 31 |
| 11 | 18 | Lance Stroll | ASTON MARTIN MERCEDES | 01:14.1 | +1.603s | 33 |
| 12 | 99 | Antonio Giovinazzi | ALFA ROMEO RACING FERRARI | 01:14.1 | +1.619s | 27 |
| 13 | 14 | Fernando Alonso | ALPINE RENAULT | 01:14.2 | +1.718s | 37 |
| 14 | 6 | Nicholas Latifi | WILLIAMS MERCEDES | 01:14.3 | +1.781s | 41 |
| 15 | 3 | Daniel Ricciardo | MCLAREN MERCEDES | 01:14.3 | +1.794s | 36 |
| 16 | 31 | Esteban Ocon | ALPINE RENAULT | 01:14.3 | +1.833s | 37 |
| 17 | 9 | Nikita Mazepin | HAAS FERRARI | 01:14.6 | +2.129s | 33 |
| 18 | 47 | Mick Schumacher | HAAS FERRARI | 01:14.8 | +2.314s | 35 |
| 19 | 63 | George Russell | WILLIAMS MERCEDES | 01:14.8 | +2.353s | 35 |
| 20 | 16 | Charles Leclerc | FERRARI | 01:19.6 | +7.131s | 4 |
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