The Brownlee brothers took gold and silver medals at a rapturous homecoming for the triathletes in Leeds.
Alistair pipped his brother, winning in one hour, 46 minutes and 51 seconds.
Jonny crossed the line 12secs later with Spain's Fernando Alarza coming in third.
It was a historic day for Great Britain as the nation managed to produce, for the first time for any country, four compatriot male triathletes finishing in the top-five of a World Triathlon Series event.
Britain's Tom Bishop and Adam Bowden finished fourth and fifth respectively after losing touch with Alazra during the 10km run.
The Brownlee’s dominated proceedings, opening up a gap during the cycling section of the race.
Their lead ballooned as they cycled through Leeds city centre, allowing them breathing space of over a minute during the transition from cycling to running.
Alistair managed to pull away from his younger brother to take victory on the day.
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