Zhang vows to do his homework

'Watch and learn' is rising star's challenge ahead of facing Djokovic

China's Zhang Ze promised to watch and learn from Novak Djokovic after he registered one of the biggest wins of his career to set up an expected meeting with the world No 1.

Zhang, listed at 219 in the world rankings, savored a rare victory over a top-100 player after he upset Uzbekistan's 70th-ranked Denis Istomin 6-3, 1-6, 6-3 on Monday in the opening round of the China Open.