September 1, 2018

Pierre Gasly on track in the Toro Rosso

© Lars Baron/Getty Images

September 1, 2018

Brendon Hartley on track in the Toro Rosso

© Dan Istitene/Getty Images

September 1, 2018

Brendon Hartley on track in the Toro Rosso

© Dan Istitene/Getty Images

September 1, 2018

Pierre Gasly on track in the Toro Rosso

© Mark Thompson/Getty Images

September 1, 2018

Pierre Gasly on track in the Toro Rosso

© Mark Thompson/Getty Images