Great Britain’s Liam Phillips, Kyle Evans and Tre Whyte secured their places in the moto racing at the Chula Vista UCI BMX Supercross following Friday’s time trial qualifying.
World champion Phillips set a time of 40.462 seconds, the 22nd fastest at the United States Olympic Training Centre in California with Evans 31st (40.980 seconds) and Whyte 40th (41.307 seconds) as the top 64 progressed to Saturday's racing.
British champion Dan McBride was unable to start the final round of the series after a crash in practice left the 20-year-old with concussion.
With only the top 16 making the time trial superfinal, American world time trial champion Connor Fields powered to victory in front of home support in 38.126 seconds, ahead of fellow countryman Corben Sharrah - who was fastest in the first time trial run - and Canadian Tory Nyhaug.
After the event, Kyle Evans tweeted: "31st in TT. Could of been better with some mistakes in there. But it's all about learning. Happy with it seeing as I busted my ankle in practise but I know there is more in the tank! Let's go racing!!”
McBride, who won his British title last month in Birmingham, explained that after a medical assessment it was recommended that he did not compete.
“Thanks for the messages guys, took a fall in practice n hit my head pretty hard, medics said had concussion an weren't comfortable to let me go and do time trial due to symptoms,” he tweeted.
“Really gutted as was loving it out here n feeling good.”
In the women’s competition, Felicia Stancil completed an American double, her time of 39.114 seconds marginally quicker than Laura Smulders’ (Netherlands) effort of 39.142 seconds with Alise Post of the USA completing the podium in 39.485 seconds.