Willis next races over 800m at the final meeting of the Classic Series in Wellington this weekend before stepping back to a mile in Nelson on February 8.
"Then I'm off for a 2000m race in New York City before the Worlds in Poland on March 8," Willis said immediately after Monday night's effort.
Even to the untrained eye, Willis' race in Wanganui appeared effortless.
"I felt great and right where I want to be at this stage of the season. It's been a great seven weeks training here - I can't wait," Willis said.
Meanwhile, with the scratching of former Wanganui athlete Holly van Dalen, the Classic Hits Women and Junior Women's Mile field was reduced to mainly the younger brigade.
The race, however, lost none of its excitement with Canterbury University runner Angie Smit posting a solid win over her brave teammate Rosa Flanagan. Smit ran the trip in 4:43.66, while Flanagan posted 4:46.37.
Flanagan continues to perform at a top level and mainly against far bigger opponents. She may be small, but her heart is huge and she only succumbed to a stronger Smit over the last few hundred metres. Former Wanganui athlete Caroline Mellsop, now running out of the Scottish club in Wellington, battled well into third spot.
The Young Olympians Harvey World Travel and Wanganui Collegiate Junior Men's Mile was taken out convincingly by Jordan Rackham from Invercargill in 420.79 with Jeff Lautenslager from Nelson holding second with a time of 4.21.93 from teammate Mike Lowe, third in 4.23.57.