"We are just over 10 months away from the London Olympics. Marc is disappointed as he wanted this title but he definitely understands the big picture."
Walker was the only rider under the 37-second barrier in the elite women's competition, clocking 36.802 to be 0.4s ahead of American Arielle Martin and world champion Mariana Pajon of Colombia. The Americans made good use of their home turf advantage with five riders in the top 10.
Later in the day one of those up-and-coming Americans, Brooke Crain, upset the favourites to take out the superfinal for the top-16 qualifiers from the time trials. She clocked 36.364 to finish ahead of Pajon, Martin and Walker, who was content with another solid run without taking undue risks ahead of racing tomorrow.
The only other New Zealander to qualify was Tauranga's Kurt Pickard, who was the 30th fastest from the 150 starters in the elite men's competition. Pickard, who has been steadily improving at the top level this year, clocked 35.644, just over a second behind top qualifier Connor Fields (USA), the former world junior champion.
Pickard will be hoping for better fortune in the draw for tomorrow's motos, as he has regularly drawn brutal heats in top level competition this year.
World junior silver medallist Trent Woodcock was a blink away from qualifying for his first supercross final. The Pukekohe teenager, also nursing a shoulder injury, was just 7/100ths of a second off qualifying.
"I'm gutted for Trent. He is riding so well when you consider he will need shoulder surgery when he gets home. He rode really strongly and was so close. It's a pity because Trent is a much better racer than time trialler right now and I think he could have progressed in this competition," said Cools.
Both Kurt James (Cambridge) and Cameron Matthews (New Plymouth) also missed out on qualifying.
Riders compete in groups of eight over three motos tomorrow with the top 32 men and 16 women then advancing to the elimination rounds.
RESULTS:
Elite women's time trial: Sarah Walker (NZL) 36.802, 1; Arielle Martin (USA) 37.222, 2; Mariana Pajon (COL) 37.259, 3.
Superfinal time trial: Brooke Crain (USA) 36.364, 1; Pajon 36.452, 2; Martin 36.499, 3; Walker 36.815, 4.
Elite men's time trial: Connor Fields (USA) 34.073, 1; Tory Nyhaug (CAN) 34.445, 2; Raymon van der Biezen (NED) 34.811, 3. Also New Zealanders: Kurt Pickard 35.644, 30 (qualified); Trent Woodcock 36.479, 67; Kurt James 36.682, 77; Cameron Matthew 36.705, 78.
Superfinal time trial: Fields 33.886, 1; Nyhaug 34.191, 2; Van der Biezen 34.409, 3.