Barcelona v Chelsea LIVE: Claudia Pina's brace, goals from Ewa Pajor, and Irene Paredes seal commanding win in Women's Champions League semi-final

Women's Champions League top goalscorer Claudia Pina netted twice in a convincing 4-1 victory over Chelsea, on a sobering evening for Sonia Bompastor's side.

Ewa Pajor fired the hosts in front after being played through on goal by two-time Ballon d'Or winner Alexia Putellas.

Putellas had already made headlines for the wrong reasons in the 12th minute when her penalty was saved by Hannah Hampton's trailing legs, but it proved to be a false dawn for the hosts.

The match - along with the tie - remained in the balance at the break, as Chelsea ended the first half strongly, with Pina playing a telling role in Barca taking a strangelhold of this contest.

Pina was introduced in the 66th minute and took a mere four minutes to make an impact, prodding home Ona Battle's cross.

Sandy Baltimore gave Chelsea something to hold onto going into next Sunday's second leg with a fine solo finish, before Irene Paredes restored Barca's two-goal finish with an excellent header from Pina's corner.

Pina wrapped up the scoring with a well-executed finish in the 90th minute, leaving Chelsea with a huge task ahead.

We go again at Stamford Bridge next week!

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Fara Williams is highly sceptical of Chelsea's hopes of turning around a 4-1 deficit next weekend.

She told TNT Sports: "The way this game unfolded, I don't think Chelsea have any chance of turning this around.

"Is it out of reach? I think so, but who knows what this Chelsea team can do?"

It's been a dominant performance from the reigning champions, leaving Chelsea a mountain to climb in next week's second leg.

Baltimore's strike gives Sonia Bompastor's hope of a comeback, but Barca were simply irresistible at times going forward.

It's Chelsea's biggest defeat for 17 months!

Chelsea have found this Barcelona frontline too hot to handle.

Pina gets her second of the match as she fires past Hampton at her near post from Rolfo's excellent assist.

A long way back for Bompastor's side now!

Bright is caught out by Pajor in some desperate Chelsea defending, but fortunately for Bompastor's side, she rifles her shot over the bar.

Paredes restores Barcelona's two-goal advantage on the night with a bullet header at the far post to meet Pina's corner!

Pina has a goal and an assist after coming off the bench.

Women's world record signing Girma replaces Bjorn for her Women's Champions League debut, while Rolfo replaces Brugts.

Pajor is denied a second by Hampton, as the Pole opens up her body and sees her shot saved by the England keeper.

The Barca forward gets into the referee's book for hauling down Bronze.

This is turning into quite a physical contest.

Macario follows up her recent yellow card with an assist, playing a ball across the edge of the box to Baltimore, who rifles home an excellent left-footed strike!

Macario receives a yellow for a challenge on Guijarro.

Pina doubles Barcelona's advantage, as this season's Women's Champions League top scorer gets her eighth of the competition, prodding home from Battle's cross.

The reigning champions have daylight now, and it's a big blow for Chelsea.

Cuthbert continues after appearing to jar her knee rather painfully there.

A true competitor for Chelsea.

Pina almost makes an immediate impact, teeing up Putellas for an angled attempt which Hampton saves.

More worryingly for Chelsea, Cuthbert goes down after colliding with Bonmati in the build-up to that chance.

Graham Hansen receives a well-deserved ovation from the crowd, as she's replaced by Pina for Barcelona's second change.

Bompastor makes a double change, taking off Kaptein and Beever-Jones and introducing Macario and Reiten.

Bright turns a Graham Hansen cross behind for a Barca corner, which comes to nothing.

Guijarro then fires a long-range effort wide.

First change, and it looks like an enforced one for Barcelona.

Leon appeared to have picked up a knock in that first half and is replaced by Engen.

Can Chelsea find their way back into this one?