This is a pairing from The Prince of Tennis. Momo and Kaidoh are rivals on the same team. They are always butting heads, fighting with each other and are very competitive against each other. This has been the case from when they were both first-years and has continued through their school lifes. However because of this they know each others styles of tennis extremely well, including mannerisms, turns of phrase and more. They have been known to be able to work together in doubles because of this and show good partner skills.