Lewis Hamilton admits he has become accustomed to trailing Mercedes team-mate George Russell after struggling in qualifying for the Mexico City Grand Prix.

Hamilton qualified in sixth for Sunday's race, one place behind Russell despite the latter reverting to an older floor for his W15 car following a crash in Friday's practice.

The seven-time drivers' champion trailed his team-mate by almost three tenths of a second and has now only beaten him in qualifying five times in 20 races this year.

Speaking to Sky Sports F1 following the conclusion of qualifying, which saw Carlos Sainz snatch pole position ahead of title contenders Max Verstappen and Lando Norris, Hamilton admitted he had struggled all year.

"I'm losing all the time, that's why I've been so bad in qualifying all year," Hamilton, who sits sixth in the drivers' championship standings, said.

"It's a normal thing and I'm used to it. We have done everything. We worked so hard in the background, like everyone does, to get the car in a nice place.

"It was feeling good in final practice, so we were like, 'let's not touch anything or do anything'. All we changed was the rear wing and it's just a drastic difference.

"Every time I get to qualifying, the car is completely different. I can't pinpoint why, but it is what it is."

Mercedes had switched to an older iteration of their car floor after both drivers struggled at last week's United States Grand Prix, with Russell now on an even older edition following his crash in second practice.

"Maybe George is more comfortable on the older package," Hamilton said. "I don't know, we'll see. We'll get a good reading of which is best."