What happened: Red Bull Racing will run Ayumu Iwasa in Isack Hadjar's RB22 during opening practice (FP1) at the Spanish Grand Prix in Barcelona. Iwasa takes over the seat for the first session of the weekend before the regular driver returns.

Why it matters: FP1 outings like this satisfy Formula 1's young-driver practice requirements while giving prospects real seat time in current machinery. The run puts a Red Bull junior on track during a grand prix weekend and offers the team a fresh read on car behavior early in the event.

What to watch: Watch whether Iwasa's FP1 pace and feedback shape Red Bull's setup direction before Hadjar returns to the RB22 for the remainder of the weekend.