Bay of Plenty men's sevens coach Peter Woods said he had not given his young flyer, who now plays club rugby for Mt Maunganui, much of an option.
"He sprained his knee in the first game and I said to him that if he didn't play the last seven minutes he wouldn't play at the nationals," Woods said.
"Then he went out against Wellington and scored those two 50m tries. He was on one leg that day."
Walker underwent fitness tests during the week and was given the nod to play at the nationals on Thursday.
If his teammates' reactions to his recent feats are any indication there will be plenty of interested onlookers at the Bayleys National Sevens this weekend.
Walker's inclusion in the 12-man Bay side will give the team added wheels to go alongside the likes of Josh Honey, who played his way into the side with an impressive showing at Blake Park last weekend.
The pair will work alongside the play-making abilities of Trinity Neera-Spooner and Te Aihe Toma and the size of players like Matt Clutterbuck, Brynn Uriarau and Ralulu Bavou.
"We haven't got a big team in the forwards but we've got speed and fitness and players capable of not taking the ball into contact too much," Woods said.
Pool play is being played today at the Rotorua International Stadium with playoffs tomorrow.
Bay matches
- Bay of Plenty sevens teams at the nationals today (day one):
- Men: v Canterbury (12.25pm), v Counties Manukau (4pm), v South Canterbury (6.40pm).
- Women: v Taranaki (10.25am), v Wellington (12.45pm), v Canterbury (3.20pm), v Manawatu (5.20pm).