Lewis Hamilton headed title rival Sebastian Vettel in first practice at the Monaco Grand Prix as Jenson Button finished 14th on his return to F1. Hamilton’s Mercedes headed Vettel’s Ferrari by 0.196 seconds as Red Bull’s Max Verstappen took third from the second Mercedes of Valtteri Bottas. Hamilton spent the first part of the session swapping fastest times with Bottas but edged clear by 0.366secs.