What happened: Red Bull Racing announced Sergio Perez's early contract termination, replacing him with Liam Lawson from sister team RB starting at the US Grand Prix. Perez scored zero points in his last six races amid poor form. Lawson partners Max Verstappen for the remaining six events.

Why it matters: The change aims to close the 33-point gap to McLaren in Constructors' standings and secure second place. Perez's struggles cost valuable points in a tight title fight. It's a bold, rare mid-season move signaling Red Bull's urgency.

What to watch: Lawson's COTA debut this weekend could shift Constructors' race.