What happened: Red Bull Racing reported a red flag at the Monaco Grand Prix after Perez stopped on track. The team said Perez was out of the car and OK.

Why it matters: A stoppage at Monaco matters because practice time is limited and track position is central to the weekend. Any lost running can compress setup work before qualifying on a circuit where passing is difficult.

What to watch: Watch for confirmation on what caused the stoppage and whether Perez's car needs repairs before the next session.