However, the damage that was to be done was already done as the visitors piled up a very big total of 241, their highest ever in T20I history. This is also the second-highest total by any team against New Zealand, behind Australia's 245 for 5 in Auckland a year ago.
The pair posted the highest third-wicket partnership by any side in a T20 global and the 241 is England´s highest total. Malan completed his ton off 48 balls while Hales had taken 60 balls.
The duo scored at a strike rate of above 200 as Malan reached his hundred at the end of the 18th over.
They made a frenetic start with the bat, racing to 49-0 inside the first four overs as Martin Guptill hit Chris Jordan out of the ground, but the innings stuttered along. Although the 33 year-old took part in some light training on Thursday, including having some throw downs, England's management have chose to be precautious by adding Bairstow to the Test party. Overall, they accumulated 153 runs in the last ten overs, which is the joint third-highest for any team.
Batting first, England made 241 runs for 3 wickets in 20 overs. England continued to shuffled their personnel, with Dawid Malan, centurion in the previous game, one of three to drop out for the series decider.
"The intent (Morgan) showed from ball one took the pressure off me especially early on in my innings".
Dot balls were a rarity in the final few overs as Malan moved smoothly towards his century.
With England having rested a number of their 50-over World Cup winners, including Ben Stokes, Jos Buttler and Joe Root, the five T20Is have given players previously on the fringes of the squad, as well as a number of new faces, the chance to impress.
Morgan was equally destructive in his blistering knock of 91. This was the third time he hit seven sixes in a T20I innings. He bettered Jos Buttler's 22-ball effort against Australia at Edgbaston past year.