Valtteri Bottas, Charles Leclerc and Robert Kubica are all in action on the second and final day of the first in-season test in Spain.
Max Verstappen set the opening day benchmark of a 1:17.528 at the Circuit de Catalunya, and he hands over the RB14 to simulation development driver Jake Dennis for his Red Bull debut on Wednesday.
Bottas will take over driving duties from Lewis Hamilton and will no doubt look to join his team-mate on racking up 150 laps in the Mercedes W09.
But all eyes will be on a certain Pole once again as he returns behind the wheel of the FW41 after his first FP1 session of the season last Friday.
Kubica said the Williams car was “embarrassing” to drive in Spain due to its lack of pace and will look to provide more valuable feedback with a full day of running.
After driving the Haas on Tuesday, Antonio Giovinazzi will change into his red overalls and take over from Sebastian Vettel in the SF71H.
Another member of the Ferrari academy, Charles Leclerc, is also back in action for Sauber following back-to-back points finishes in Baku and Spain.
Jack Aitken and Lando Norris are flying the British flag at Renault and McLaren respectively.
PlanetF1 will bring you a lunchtime report and an end of day report once the checkered flag waves at 1800 local time.
Full Wednesday line-up:
Nicholas Latifi (Pirelli tyre test)
Sean Galael/Pierre Gasly
Stoffel Vandoorne (Pirelli tyre test)
Lando Norris/Oliver Turvey