Carlos Sainz has never needed much encouragement to speak his mind, and he wasn’t about to let Kimi Antonelli’s Spa frustration slide just because it came over the radio at 300km/h.
The flashpoint arrived in Friday’s second practice for the Belgian Grand Prix, when Antonelli took exception to where Sainz’s Williams ended up on the exit of Stavelot. With the Mercedes driver arriving quickly, he vented on team radio and labelled Sainz “an idiot” — a line that travelled through the paddock about as fast as the cars do down to Blanchimont.
Sainz’s response was blunt, and it carried a little sting. He doesn’t believe he impeded Antonelli in the first place, and he pointed out that the outburst itself crossed a line.
“I think he felt like I impeded him – I don’t feel like I did,” Sainz said. “I guess nowadays with the SM [Straight Mode], if you don’t get out of the way exactly, you cannot turn because you have no downforce with the wings open.
“Maybe he felt like I could have got out of the way in a better way. But I don’t think he should call me an idiot either, on the radio. I think that’s forbidden, to swear and insult a rival – so I think he should calm down a bit.”
The “SM” detail is telling. With 2026’s systems changing how cars behave when drivers are in their low-drag settings, the margins for misunderstanding in practice are thinner: a car backing off at the wrong moment can look like a moving chicane to someone arriving committed, and the following driver may have fewer options than they’d expect because the car simply won’t rotate as it normally would. It doesn’t excuse the language, but it explains why tempers spike so easily in these sessions — particularly at Spa, where the speed makes everything feel exaggerated.
Antonelli, for his part, didn’t try to pretend it was a measured moment. He admitted the comment wasn’t his finest, but doubled down on his view that Sainz’s positioning was risky.
“He backed off out of a fast corner, you exit in seventh gear, and I had to abort and it was quite risky,” Antonelli said. “So of course I was not happy with it and of course what I said probably, in the heat of the moment, is not the best – but it was quite dangerous.”
In practical terms, nothing came of it beyond the noise. The stewards declined to investigate Sainz for a possible impediment, which in itself is a pretty loud verdict on whether there was anything sanction-worthy in the first place. And while Sainz suggested insulting a rival over the radio is forbidden, the reality in the current climate is that drivers are rarely punished for snapping at each other mid-lap — especially after the FIA’s attempt to clamp down on swearing last season was softened.
What made the whole thing slightly more intriguing was the timing. Antonelli’s radio flare-up came on a day that otherwise underlined his momentum: he topped FP2 after only sixth in FP1, and described the shift as a “massive turnaround” as Mercedes found something substantial between sessions.
“It was a massive turnaround with the car because in FP1 we struggled a lot more than anticipated,” said Antonelli, who leads the championship. “So it was a good change.
“But of course a lot of work to do because Red Bull is quick, McLaren was up there, so we just need to put things together. But the long run felt very strong as well.
“Obviously, the car changed quite a bit between the two sessions, so a lot of work to do overnight in order to be ready for tomorrow and on Sunday.”
That’s the other reason Spa radio messages carry extra weight: when you’re leading a title fight, every close call gets interpreted through a different lens. The championship leader can’t afford complacency in traffic, and rivals don’t feel obliged to treat him with kid gloves either. In Sainz, Antonelli ran into a driver who doesn’t enjoy being spoken to like a backmarker — and who also knows exactly how quickly a practice-session accusation can morph into a narrative if it’s left unchallenged.
If this were Sunday afternoon, both would likely have been more careful with their phrasing. But Fridays are for pushing limits: of the car, of the set-up, and occasionally of each other’s patience. Spa has a way of amplifying all three.
