Great Britain's Liam Phillips produced a near faultless lap to win the time-trial at the UCI BMX Supercross World Cup in Santiago del Estero on Saturday.
Phillips, who leads the overall series after three rounds of five, was last out on course and stopped the clock in 31.686 seconds to seize the victory from American Connor Fields.
Kyle Evans finished 11th, the 20-year-old’s lap timed at 32.655 seconds.
“I feel really good,” 2013 world champion Phillips said after the victory in hot conditions at the outdoor track.
“I spoke with Kyle (Evans) after practice this morning and we both time-trial reasonably well all of the time but we are never on the edge.
“We both said we were going to go out and try and leave everything on the track and if we make a mistake in the process so be it.
“I’m obviously really pleased to win. I haven’t won a time-trial away from Manchester, I'm looking forward to tomorrow.”
Both Britons will now focus on Sunday’s racing, with 25-year-old Phillips aiming to become the first British male to win the overall series title.
Earlier world championship bronze medallist Tre Whyte safely progressed from the qualifying motos and will join Phillips and Evans on Sunday.
Outside of the top-16 ranked riders, Whyte was forced to go through the three races but the 19-year-old comfortably advanced with a third, second and first place in the heats.
Colombian Olympic and world champion Mariana Pajon won the elite women's time-trial.
Sunday’s supercross racing starts at 7.30pm UK time with live video on the British Cycling website.