From AP – A Chinese fighter’s victory at a Macau showdown brings the world’s top casino market a step closer to challenging Las Vegas for dominance of another Sin City staple: big-time boxing matches. Macau, which long ago eclipsed Vegas as the world’s top gambling city, is now looking to add to its allure by holding the kind of boxing bouts that Las Vegas is known for. The tiny Chinese enclave is hosting a series of high-profile bouts this year featuring a pair of Asian stars: Chinese two-time Olympic gold medalist Zou Shiming and Philippine fighter Manny Pacquiao. Zou made…