India's ace shuttler Saina Nehwal has stormed into the quarterfinals of the All England Open Badminton tournament at Birmingham. World number 7 Saina defeated Beiwan Zhang of the United States, 24-22, 18-21, 21-19 to book a place in the quarterfinals last night.Saina will face a tough challenge today in her quest for a semi-final berth. She will take on higher ranked Chinese Shixian Wang.Saina is the lone Indian left in the tournament.