Taekwondo: Bianca Walken aims to be invincible Great Britain's Bianca Walkden intends to build on gold at the Spanish Open to make herself "unbeatable" in the taekwondo World Championships later this summer. The 21-year-old Liverpudlian, who missed out on a place at the London Olympics to Sarah Stevenson, powered to another impressive over-73kg title in Alicante on Saturday. Martin Stamper narrowly beat long-time rival Vladimir Kim of Russia in the under-68kg final.