Chinas No 1 tennis player and US Open champion Zhang Shuai kept up her remarkable recent doubles form by reaching the semi-finals of the J&T Banka Ostrava Open with partner Sania Mirza.The Chinese-Indian duo saw off the threat of Lidziya Marozava of Belarus and Kazakhstans Anna Danilina in the quarter-final of the WTA 500 tournament in the Czech Republic.World No 13 doubles player Zhang and 110th-ranked Mirza, who partner
