'Lucky locker' has Zhang dreaming of wearing crown

China's unlikely contender sets sights on Keys

China's Zhang Shuai is daring to dream she can extend her amazing run all the way to the Australian Open title, crediting the use of compatriot Zheng Jie's "lucky locker" for her inspirational performances.

Against the odds, qualifier Zhang has upset three dangerous opponents to reach the fourth round: world No 2 Simona Halep, 33rd-ranked Alize Cornet and Varvara Lepchenko, ranked 51.