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New Zealand took a 4-0 lead over Great Britain in the America's Cup to edge towards retaining their title.
Ben Ainslie's Ineos Britannia team fell 3-0 behind on Sunday, and the fourth race was abandoned because there was not enough wind in Barcelona.
The race was pushed back to Monday - originally designated a reserve day - and, after a tight start, Emirates Team New Zealand won by more than 300m.
Britain, who were aggrieved that an umpire's decision went against them on Sunday in the pre-start, protested against New Zealand during a series of close crosses.
New Zealand need only three more wins to take the best-of-13 series for a third consecutive year.
Britain have never won the America's Cup in its 173-year history.
"We will push all the way. We can come back from this," said GB skipper Ainslie.
The fifth and sixth races take place on Wednesday.