Sam Kerr's threat was snuffed out by Bayern Munich's defence as the German giants beat Chelsea 2-1 in the first leg of their UEFA Women's Champions League semi-final clash, putting the Blues' hopes of a 'quadruple' at serious risk.
WATCH the UEFA Women's Champions League Final LIVE, FREE and in HD on SBS and live streamed via SBS On Demand on Monday May 17.
Hanna Glas scored a goal and set up another as the home side earned a big victory to take to Chelsea's Kingsmeadow ground next week - but it was a frustrating day for Australian captain Kerr, who's been in sparkling form.
Having scored one and made another goal in the midweek WSL draw at Manchester City that could see Chelsea lift the crown, Kerr was the danger woman in the eyes of the German defenders, who marked her and strike partner Fran Kirby effectively.
Indeed, her most effective work came when she delivered a potentially goal-saving flicked header in defence in the first half as Bayern streamed forward.
Sweden defender Glas fired a left-footed shot inside the near post early in the second half which proved the winner.
Sydney Lohmann had opened the scoring 12 minutes in with a powerful header after a right-footed cross from Glas had bounced off the hands of Chelsea goalkeeper Ann-Katrin Berger.
Melanie Leupolz equalised for Chelsea against her former team in the 23rd minute.
Glas carried the ball down the right before cutting inside and unleashing her decisive strike from the top of the box in the 56th minute.
"Hanna is one of the best right-backs in the world," said Bayern coach Jens Scheuer, though adding he was "surprised that she can score with the left foot. I underestimated her a little bit."
Chelsea manager Emma Hayes, whose side have already won the League Cup and are favourites to lift the FA Cup and WSL trophies, said it "wasn't our best performance" but sounded an optimistic tone ahead of the second leg in London next Sunday.
"It's 2-1 and we've got an away goal," she said. "We're not out of it. We're very much in it."
Chelsea captain Magdalena Eriksson sat out with a calf injury and remains uncertain for the second leg.
"The reality is, I don't know," Hayes said. "I just hope she's available."
In the other semi-final first leg, Barcelona drew 1-1 at Paris Saint-Germain, securing a valuable away goal through Jenni Hermoso's competition-leading sixth before she later had to leave the game with an ankle injury.
PSG equalised through US defender Alana Cook in the 21st minute, with the right-back heading in after France striker Marie-Antoinette Katoto nodded the ball down to her.