Friday in Spain is the teams' last chance to hone and develop their cars ahead of the season-opening Grand Prix in Australia on March 25...

Fernando Alonso (ESP) McLaren MCL33 with aero paint at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Esteban Ocon (FRA) Force India VJM11 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Fans at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Lewis Hamilton (GBR) Mercedes-AMG F1 W09 EQ Power+ with aero sensors at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Jack Aitken (GBR) Renault Sport F1 Team Third and Reserve Driver at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Daniel Ricciardo (AUS) Red Bull Racing RB14 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Brendon Hartley (NZL) Scuderia Toro Rosso STR13 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Romain Grosjean (FRA) Haas VF-18 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Sergey Sirotkin (RUS) Williams FW41 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Carlos Sainz jr (ESP) Renault Sport F1 Team RS18 with aero sensors at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Charles Leclerc (MON) Alfa Romeo Sauber C37 crashes at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Stefano Arcari/Sutton Images

Charles Leclerc (MON) Alfa Romeo Sauber F1 Team walks in after crashing at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Stefano Arcari/Sutton Images

Lewis Hamilton (GBR) Mercedes-AMG F1 W09 EQ Power+ at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Sergey Sirotkin (RUS) Williams FW41 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Jerry Andre/Sutton Images

Robert Kubica (POL) Williams talks with the media at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Romain Grosjean (FRA) Haas VF-18 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Charles Leclerc (MON) Alfa Romeo Sauber C37 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Brendon Hartley (NZL) Scuderia Toro Rosso STR13 and Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Maurizio Arrivabene (ITA) Ferrari Team Principal at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Fernando Alonso (ESP) McLaren MCL33 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Kimi Raikkonen (FIN) Ferrari SF-71H at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images

Carlos Sainz jr (ESP) Renault Sport F1 Team RS18 at Formula One Testing, Day Four, Barcelona, Spain, 9 March 2018. © Mark Sutton/Sutton Images
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