Dec. 12 (UPI) -- Hong Kong brings down the curtain on the year's top-level racing Sunday with four Group 1 events that feature two of the world's best horses -- both of them defending the home turf.

Kentucky Derby hopefuls are in action in California and Japanese fillies vie for attention in Hanshin. It's a short schedule but a stellar one.

Around the world, around the clock

Hong Kong

To quote Jim Croce, albeit way out of context, "You don't tug on Superman's cape."