Which players have been key so far?published at 19:35 Greenwich Mean Time 27 March
Chelsea v Man City (20:00 GMT, agg 0-2)

The first part of this gripping story - the League Cup final - was decided by three scrappy goals, but last Wednesday's outing at Joie Stadium was decided by two moments of quality from City substitute Vivianne Miedema.
Back to form after returning from knee surgery in January, the Netherlands forward provided the ruthlessness which her side badly needed in the cup final defeat.
Winger Kerolin was City's main attacking outlet for much of the European tie on Wednesday, causing problems down the right as she teed up Miedema's second.
And the 25-year-old Brazilian opened the scoring in Sunday's game three in wonderful fashion, running from the halfway line and wrongfooting Millie Bright before squeezing a finish through the Chelsea captain's legs.
But her chances were limited in the second period as Chelsea forward Johanna Rytting Kaneryd made a greater impact at the other end, with her pace and trickery getting the better of Gracie Prior as she set up Chelsea's equaliser for striker Aggie Beever-Jones.
Cuthbert was influential when she came off the bench, piling pressure on City's midfield with determined tackles and intense pressing, before a diving header for the winner in added time.