Zou Shiming's learning curve is definitely getting shorter.

China's two-time Olympic gold medalist demonstrated as much on Sunday by following an old boxing axiom to the letter: when you get an opponent in deep water, you have to try to drown him.

In just his third pro fight, Zou had Juan Toscano gasping and grasping in their featured flyweight prelim on Top Rank's 'Clash in Cotai' in Macao, but despite constant pressure and crisp, accurate punching, Zou could not make the granite-chinned Mexican kiss the canvas.