I think you may be getting confused with the Dubai Cup. It's the one on a Dirt track at night time. It's in late March I think.

The Japan Cup was actually on about a month ago. It used to be an important race for Australians in the days of Better loosen Up etc, but now they don't seem to send Australian horses over for it. I don't even have any idea what won it this year. Probably a Japanese horse that we've never heard of over here.