The competition, in which competitors have to run an obstacle course in their underwear, has become a staple part of the rodeo since it was introduced three years ago.
Adam Coley, of Cromwell, placed first in the men's dash around the arena.
He also competed in the second division bull ride at the rodeo.
When asked how he performed in the bull ride, Coley said "not very well".
However placing first in the men's underwear run made up for it with a prize of $250. It was his first time at the Lawrence Rodeo but he had competed in other rodeos.
Joanna Harwood, of Dunedin, was second in the women's division and won $150.
She was more than happy with the money.
"I was stoked because I was pretty knackered."
Hellewell was also named the all-round Lawrence champion.
The top eight men and women rodeo competitors with the highest points from the rodeos on the national circuit will earn a spot in the finals.
The New Zealand Rodeo Cowboys Association circuit will continue on Waitangi Day with the Outram Rodeo.
Lawrence Rodeo Open Division results (winners only)
Rope and tie: Corey Church (Rotorua)
Bareback: John Hughes (Fairlie)
Team roping: Georgie and Nev Sarginson (Darfield)
Steer wrestling: Rex Church (Te Kuiti)
Saddle bronc: Wade Marshall (Invercargill)
Barrel race: Rhondine Long (Middlemarch)
Bull ride: Wade Marshall (Invercargill).