Head-to-head · 18 bouts
Ryuko Seiho and Kotozakura Masakatsu have met 18 times in recorded sumo. Kotozakura Masakatsu leads 16–2.
Ryuko Seiho has won with: slap down (1), frontal thrust out (1).
Kotozakura Masakatsu has won with: frontal force out (6), over arm throw (4), frontal crush out (2), frontal lift out (2), frontal push out (2).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| May 1968 | Day 2 | Kotozakura Masakatsu | Frontal crush out | Ozeki 2 East vs Maegashira 3 East |
| January 1969 | Day 1 | Kotozakura Masakatsu | Over arm throw | Ozeki 2 East vs Maegashira 3 East |
| March 1969 | Day 12 | Ryuko Seiho | Slap down | Ozeki 2 East vs Maegashira 9 West |
| May 1969 | Day 6 | Kotozakura Masakatsu | Over arm throw | Ozeki 1 East vs Maegashira 2 East |
| July 1969 | Day 7 | Kotozakura Masakatsu | Frontal force out | Ozeki 2 East vs Maegashira 1 East |
| September 1969 | Day 2 | Kotozakura Masakatsu | Frontal lift out | Maegashira 1 East vs Ozeki 1 West |
| January 1970 | Day 3 | Kotozakura Masakatsu | Frontal push out | Ozeki 2 East vs Maegashira 1 West |
| March 1970 | Day 1 | Ryuko Seiho | Frontal thrust out | Komusubi 1 West vs Ozeki 1 West |
| May 1970 | Day 8 | Kotozakura Masakatsu | Frontal force out | Ozeki 1 East vs Komusubi 1 East |
| July 1970 | Day 1 | Kotozakura Masakatsu | Over arm throw | Maegashira 3 East vs Ozeki 1 West |
| November 1970 | Day 3 | Kotozakura Masakatsu | Frontal force out | Ozeki 2 East vs Komusubi 1 East |
| January 1971 | Day 1 | Kotozakura Masakatsu | Frontal push out | Ozeki 2 East vs Maegashira 1 East |
| March 1971 | Day 8 | Kotozakura Masakatsu | Frontal crush out | Maegashira 1 West vs Ozeki 1 West |
| May 1971 | Day 4 | Kotozakura Masakatsu | Frontal lift out | Ozeki 1 East vs Maegashira 2 West |
| July 1971 | Day 13 | Kotozakura Masakatsu | Over arm throw | Maegashira 6 East vs Ozeki 2 West |
| September 1971 | Day 3 | Kotozakura Masakatsu | Frontal force out | Ozeki 2 East vs Maegashira 1 West |
| November 1971 | Day 4 | Kotozakura Masakatsu | Frontal force out | Maegashira 3 West vs Ozeki 1 West |
| September 1973 | Day 11 | Kotozakura Masakatsu | Frontal force out | Yokozuna 1 East vs Maegashira 5 West |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.