Casino revenue in Macau, the world's biggest gambling market, grew last month at the slowest pace since the global recession in 2009 as China's economic slowdown crimped demand from high-rolling gamblers. Macau gambling authorities released data Wednesday that showed July revenue rose to 24.58 billion patacas ($3.1 billion), up 1.5 percent compared with a year earlier and the lowest growth rate since mid-2009. Macau casino revenues have rocketed in recent years thanks to legions of mainland Chinese high-rollers.