"The purpose of my running here at Cooks Gardens and in Wellington (Capital Classic Saturday) was to get ready for the North American indoors on January 26. The pace was probably a bit too strong early and then a couple of really strong gusts slowed momentum.
"These young guys really kept me honest tonight and I'm rapt with the effort."
Willis conceded he was not getting any younger, but felt in great order for the challenges ahead.
Pieters, as directed set the pace with Willis hot on his heels and with around 800m to go took control dictating his own pace for the remainder of the race.
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The younger brigade gave him no peace in front, but in the end Willis was simply too classy drawing away at the line to beat fellow Kiwi international Julian Oakley (3.42.26) and his Tauranga team mate Sam Tanner (3.43.01) by several lengths.
The only record to fall on the night was the Cooks Gardens high jump benchmark of 2.17m by Christchurch athlete Hamish Kerr.
Kerr lept 2.22m beating the old record set by Australian Chris Dodd in January 2015 and equalled by Kerr a month later that same year.
After breaking the record by 5cm, Kerr then had three close, but unsuccessful attempts at 2.26m.