Carlos Sainz Jr. expressed his happiness as he secured seventh position on the grid for the British Grand Prix.
Sainz Jr. described Friday's practice sessions as the most difficult ones of the campaign for Toro Rosso but secured a place in Q3 in the STR11.
Sainz Jr. was initially the slowest driver in Q3 but profited from Nico Hulkenberg and Fernando Alonso having their quickest lap times deleted due to exceeding track limits, and moves up from eighth to seventh due to Sebastian Vettel's gearbox penalty.
"I’m extremely happy with today’s qualifying result, especially after having had quite a tough Friday yesterday," he said.
"We stayed until late last night to analyse all the data, we made a few changes on the car and today I felt very comfortable – we found half a second of performance that gave us the opportunity to fight for Q3.
"It’s incredible how tight the midfield is, but I did a good lap, managed to get that extra tenth and be the top car of the midfield teams.
"To start from P7 tomorrow is a great achievement for the whole team and I like to thank everyone for their constant hard work."
Team-mate Daniil Kvyat was only 15th quickest in Q2 amid claims that he was held up by Renault's Kevin Magnussen.
Stewards investgated the incident but concluded that there was not sufficient claim for Magnussen to be penalised.