Carlos Sainz Jr. believes Toro Rosso's slow pit stops during the Monaco Grand Prix compromised his chance of scoring a strong haul of points.
Sainz's first stop took 27.7 seconds - from pit entry to exit - while his second lasted 28.1s, which compares unfavourably to the best of the race, achieved in a time of 24.6 seconds by Williams.
Sainz Jr. finished the race in eighth place but believes a better result was within reach.
"I’m not that happy finishing in P8 if I say the truth, because I felt that there were some big points on the table for us and we lost the opportunity of making them ours," he said.
"From my side, I kept the car away from the walls and was fast on all three compounds, so I’m happy with that, but it’s disappointing to have lost positions during our pit-stops.
"We definitely need to analyse why this happened, as we threw away many points because of this.
"Anyway, P8 means 4 points, which is not that bad – I would’ve been happy with this if you had told me before coming to Monaco, but after starting from P6 and seeing how chaotic the race was, I’m sure we could’ve done better."