[hkocph]

Does anyone know which asian bookmaker is usually the earliest one open their odds in a match?

[bookieslayer]

Go to an odds comparison website like odds portal and then when the match you are interested in pops up, click on it and check the bookie that has offered the odds first. You can then check back every few minutes to see which bookies follow next so on and so forth.
It works for me and the sport I follow anyhow.