Championship leader Charles Leclerc topped the opening practice at the inaugural Miami Grand Prix on Friday.
Leclerc covered the 19-turn, 3.36-mile circuit (5.41 kilometers) in 1 minute, 31:098 seconds in his Ferrari in the first of two looks at the purpose-built course around Hard Rock Stadium. George Russell was second fastest for Mercedes, which has been slow out of the gate this season with its new car.