So should New Zealand consider jiggling the batting order to give the likes of captain Ross Taylor, Kane Williamson and Jesse Ryder - assuming he's over the stomach bug which has ruled him out of the last two games - more time at the crease?
It's unlikely coach John Wright and Taylor will make substantial changes, but a tinker here or there could be in order.
Understandably, Guptill is pleased with things as they are.
"I'm feeling good with the bat at the moment," he said yesterday. "Batting with Brendon [McCullum] and Rob [Nicol] up the order has helped me, they let me play my game.
"Brendon and I bat well together, we complement each other quite well and he kept me going right through."
The pair put on 157 for the second wicket as New Zealand chased down Zimbabwe's 259 for eight with 10 balls to spare. McCullum had lives on 0, 23, 31 and 57 before falling to a sharp catch at backward point.
But the middle order stumbled to the line, although B.J. Watling was unluckily run out at the non-striker's end, a Williamson on drive ricocheting to bowler Keegan Meth, who lobbed the ball back onto the stumps.
Earlier, Brendon Taylor became the first Zimbabwe batsman to score back-to-back ODI centuries, with a run-a-ball 107 not out.
He got good support from Malcolm Waller - later the culprit on the two easiest chances offered by McCullum in the deep - in an 86-run stand for the fifth wicket.
Lively left-armer Andy McKay took his best ODI figures in his 16th international, four for 53, while veteran medium pacer Jacob Oram took three for 48 and Graeme Aldridge got the other in his debut ODI.
"I think it was pretty comfortable at the end," Ross Taylor said. "We took our catches, which Zimbabwe didn't."