George Russell has responded to David Coulthard’s criticism of Mercedes teammate Lewis Hamilton after the 39-year-old’s difficult start. Hamilton has failed to finish in the top six at any of the opening three races for the first time in his career. But Russell has leapt to the defence of the seven-time world champion in comments relayed by Nextgen-Auto. Hamilton is in his final year with the team before he jumps ship to rivals Ferrari for 2025. Russell has out-qualified him at each of the first three races, and scored 18 of Mercedes’ 26 points so far. READ MORE: Mercedes driver Lewis Hamilton…