Charles Leclerc smashed into the back of Lance Stroll's Aston Martin before giving himself an early boost with the fastest lap for Ferrari in first practice for his home Monaco Grand Prix on Friday. Last year's winner from pole position clocked the leading time of one minute and 11.

F1 and its governing body, the FIA, hope a rule change for Sunday’s race will change that. Drivers will be forced to change tires at least twice in the hope that more pit stop strategy could shake up an event where Saturday qualifying — and the resulting grid position — is often more important than race day.