Tomo is very likely to play singles only. If Japan meets China, CNT will likely send ML, FZD, XX to be safe and it is almost impossible that XX plays singles only. It is pointless to have two right-handed play doubles when the remaining left-handed was their partner when crowned WTTC doubles champion. Tomo will face either ML or FZD in the 2nd set. If Tomo meets XX, it must be 4th or 5th set; no way 3:1 to China when Tomo beats XX.
As a matter of fact, under the new play system, it is the doubles of the 1st set that Japan has a chance (remember the current WTTC doubles champion XX/FZD lost to Tomo and Yuto Kizukuri twice?). My prediction if China plays Japan: ML/XX-, FZD-Tomo, ML-, China 3:0.