Thirteen laps into Sebastian Vettel's long-run on the option tyre around the Austin track during practice, it was beginning to look as if the rubber had given its best and he was into the grip drop-off phase.
Had that been the case, then it would be difficult to imagine how he might do a one-stop race - much the favoured strategy around here - and, that being so, then perhaps Lotus's Romain Grosjean might be able to give him and Red Bull team-mate Mark Webber a race.
The inaugural Saudi Arabian Grand Prix was a race packed full of incident as Formula 1 2021's title contenders repeatedly clashed on track. Lewis Hamilton won out over Max Verstappen to level the scores heading into next weekend's Abu Dhabi finale, as Jeddah turned F1 into a drama series
Dropped by Red Bull last season, Alexander Albon has fought back into a Formula 1 seat with Williams. ALEX KALINAUCKAS explains what Albon has done to earn the place soon to be vacated by the highly rated George Russell
Mercedes led the way in practice for Formula 1’s first race in Jeddah, where Red Bull was off the pace on both single-lap and long runs. But, if Max Verstappen can reverse the results on Saturday, factors familiar in motorsport’s main electric single-seater category could be decisive in another close battle with Lewis Hamilton
Earning praise from rivals has been a welcome sign that Lando Norris is becoming established among Formula 1's elite. But the McLaren driver is confident that his team's upward curve can put him in the mix to contend for titles in the future, when he's hoping the compliments will be replaced by being deemed an equal adversary
After a disastrous 2020 in which it slumped to sixth in the F1 constructors' standings, Ferrari has rebounded strongly and is on course to finish third - despite regulations that forced it to carryover much of its forgettable SF1000 machine. Yet while it can be pleased with its improvement, there are still steps it must make if 2022 is to yield a return to winning ways
OPINION: The pressure is firmly on Red Bull and Mercedes as Formula 1 2021 embarks on its final double-header. How the respective teams deal with that will be a crucial factor in deciding the outcome of the drivers' and constructors' championships, as Autosport's technical consultant and ex-McLaren F1 engineer explains
Humble yet blisteringly quick, Charles Leclerc is the driver Ferrari sees as its next world champion, and a rightful heir to the greats of Ferrari’s past – even though, by the team’s own admission, he’s not the finished article yet. Here's why it is confident that the 24-year-old can be the man to end a drought stretching back to 2008
Why David Ward's plans backfired
US GP: Sebastian Vettel goes fastest in second F1 practice