As Formula 1 heads into a late season triple-header, Mercedes, Aston Martin and Haas brought upgrades this weekend, while the issue of track limits looms large with 78 infringements in FP1 alone.

Martyn Lee is joined by Alex Kalinauckas (Grand Prix Editor, Autosport) to discuss the dynamics at COTA, the intriguing grid line-up, and the unexpected performances we saw today. Will Verstappen be cursing track limits? Is Norris eyeing his maiden F1 win? And what's with the performance disparity among the Mercedes drivers?

We also talk about the bumpy surface in Austin and how a Thursday night track run helped Autosport to better understand how the surface might play a big role this weekend.

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