Sergio Perez is seeking answers after finishing nearly three-tenths down on team-mate Max Verstappen in Mexico City Grand Prix practice.
The Red Bull driver set a quickest time of 1:18.988 in FP2 during the Soft tyre runs in front of his home crowd at the Autodromo Hermanos Rodriguez, but his run was disrupted by a yellow flag for a high-speed Fernando Alonso spin in the second sector.
Despite setting the fifth fastest time and an otherwise relatively clean day, Perez is hopeful that there is more to come from his RB19, as he looks to strengthen his grip on second place in the Drivers' championship.
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Perez: We didn't get a good read
"I would say we didn’t have a straight forward day, we didn’t get a good read on the Soft tyre over a single lap," said the Mexican.
"I had a yellow flag [on my first lap] so I ended up doing [my fastest time] on my second timed lap, and then my lap wasn’t tidy and I nearly ended up going off in the final corner.
"There are still plenty of things to understand, especially the different compounds to get a good read for Sunday.
"Overall we are looking in a good position and I think we have a good direction [on car set-up].
"Things are looking good but as we know, qualifying is going to be tight."