He has made four centuries and seven fifties in 19 innings .
82.75 Joe Root 's average in the first Tests of a series since 2014 - the best among all batsmen with 15 or more innings .
Joe Root has made four centuries and seven fifties in 19 innings .
82.75 Joe Root 's average in the first Tests of a series since 2014 - the best among all batsmen with 15 or more innings .