11 May 2015BMX Supercross World Cup: Liam loses lead after early exit
Defending champion Phillips is now fourth in the overall standings, 30 points behind leader Sam Willoughby.
Fellow Brits Kyle Evans and Charlotte Green also suffered early exits.
Evans went out in the quarter-finals, while Green departed the women's competition at the moto stage.
Tre Whyte did not start after suffering a knee injury during a crash in practice on Saturday.
Dutch rider Niek Kimmann, junior world champion in 2014, won the men's event, while Olympic champion Mariana Pajon claimed the women's race.