To determine whether a country will top the group match or win in the sudirman cup, that country needs to be good in all the events such as MS, WS, MD, WD and MD. Of course the doubles events are more important here as there are 3 doubles event compared to 2 single events. So it is very important to have very good doubles in order to advanced in the group match or top the group. Without good doubles player it will be very difficult for the country to advance in the group stage. So if we are to look at which country have good doubles player, we can more or less guess which country will win and topped the group match. To know which country have good doubles player, we can know it based on the doubles player performance form the recent tournaments that they have participated.