By Daniel Moxon Christian Klien thinks it took just five races for Max Verstappen to “mentally break” team-mate Sergio Perez this year. The Mexican began the season strongly with two wins from the first four races. He looked to be a genuine challenger to his fellow Red Bull racer with both of them clearly in possession of much quicker cars than anyone else. But Verstappen struck a crucial blow at the Miami Grand Prix, in early May. He qualified just ninth while Perez was on pole, but managed his tyres outstandingly to still beat his team-mate to the victory. After that, Perez’s form began to w…