Lewis Hamilton says he is "still struggling" with his car despite a strong practice showing from Mercedes at the Miami Grand Prix on Friday that has raised hopes of a genuine three-team battle for Sunday's much-anticipated street race. Mercedes have been lacking pace all season but appear to finally be in contention following make-or-break upgrades in America, with George Russell topping Practice Two on the opening day in Miami. Hamilton placed fourth, two-tenths off his young Mercedes team-mate Russell. The seven-time world champion says he can see the car is improving "bit by bit" but does not believe all of the issues are solved. Russell tops P2, rivals hit...
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