F1 Test | Sky Sport, Kubica's debut and all the topics of day 4: Mara Sangiorgio's point [VIDEO]

Speaking during the morning edition of Sky Sport 24, Mara Sangiorgio took stock of the situation regarding the fourth day of pre-season testing on the Barcelona track, underlining how the teams have also begun to work seriously on the C4 and C5 compounds, that is, the softer compounds brought by Pirelli for these tests in Spain.

Precisely in this sense, the best performance of Alexander Albon should be noted, very good at making the most of the C5 compounds, followed by Daniel Ricciardo and Lewis Hamilton.

Note fourth place for Charles Leclerc, with the latter continuing the work on the C3 started two days ago, and Robert Kubica's first returns to the track with the FW42.

The session, we remind you, is currently paused and will resume at 14.00 pm.