By Daniel Moxon Max Verstappen followed up his Sprint victory to secure pole position for the Miami Grand Prix. The Dutchman was challenged by both Ferraris but held them off to maintain his perfect record so far this season. He is the first driver to land himself on pole for the first six races of a season since Alain Prost in 1993. Charles Leclerc had to settle for sharing the front row with the Dutchman while Ferrari team-mate Carlos Sainz was third quickest. Both Mercedes cars were off the pace again though with George Russell and Lewis Hamilton more than eight-tenths of a second slower. V…