Arsenal were stunned 1-0 by Liverpool in front of a record-breaking WSL crowd on the first day of the new season, while Manchester United came from behind to win at Aston Villa.
The Gunners, playing in front of the division's biggest-ever crowd of 54,115 at the Emirates Stadium, named star forward signing Alessia Russo in their ranks for the first time but drew a blank against Matt Beard's determined visitors.
Arsenal saw more than 60 per cent of the ball but managed only three shots on target across the 90 minutes as they fell to a third consecutive WSL defeat without scoring, following back-to-back losses against Chelsea and Aston Villa at the end of last season.
Mimi Taylor's goal three minutes into the second half was enough to earn three points for the visitors, who did not win a single away game in the WSL last season.
She turned home Missy Bo Kearns' cut-back to silence the packed Emirates, and leave title-hopefuls Arsenal already off the pace after the shock result of the opening weekend.
Rachel Williams scored a late winner as Manchester United came from behind to beat 10-player Aston Villa 2-1 at Villa Park.
With the game into the second minute of added time, a cross into the box from Nikita Parris found Williams, and her header back across the goal beat Villa goalkeeper Daphne van Domselaar.
"It was a top match, we fought to the very end. We are very happy to score the two goals and come back from behind. It was hard work but we just kept going," United's other scorer Lucia Garcia said.
Last season's WSL runners-up United fell behind in the 76th minute to a Rachel Daly goal. Daly, top scorer last season, controlled a pass from Adriana Leon before firing past 'keeper Mary Earps.
Villa's goal came just two minutes after
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