Gurbani Singh delivered a knockout punch on Aditi Ashok as she eliminated the defending champion and moved into the final of the Usha All India Ladies Matchplay Championships in Kolkata on Saturday.In a clash that was billed as the 'final before final', Gurbani rallied on the back-nine and won 3&2, which also sealed the Order of Merit for her.In the other semi-final, Millie Saroha was beaten by the less fancied Gursimar Badwal 3&2.The 36-hole final will be played with the first 18 in the morning and the next 18 in the afternoon.Gurbani will start as the favourite but the match should be well-fought as Gursimar has shown herself to be very tenacious.