Head-to-head · 16 bouts
Wakahayato Koji and Toyonoumi Shinji have met 16 times in recorded sumo. Wakahayato Koji leads 9–7.
Wakahayato Koji has won with: frontal force out (8), beltless armthrow (1).
Toyonoumi Shinji has won with: frontal force out (4), slap down (2), thrust down (1).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| November 1994 | Day 3 | Wakahayato Koji | Frontal force out | Juryo 8 East vs Juryo 9 East |
| July 1995 | Day 14 | Wakahayato Koji | Frontal force out | Juryo 7 West vs Juryo 1 West |
| September 1995 | Day 1 | Toyonoumi Shinji | Frontal force out | Juryo 5 East vs Juryo 5 West |
| January 1996 | Day 9 | Wakahayato Koji | Frontal force out | Juryo 7 East vs Juryo 5 West |
| May 1996 | Day 2 | Toyonoumi Shinji | Frontal force out | Juryo 3 East vs Juryo 6 West |
| July 1996 | Day 11 | Wakahayato Koji | Frontal force out | Juryo 2 East vs Juryo 9 West |
| September 1996 | Day 12 | Toyonoumi Shinji | Thrust down | Juryo 5 East vs Juryo 11 East |
| November 1996 | Day 10 | Wakahayato Koji | Frontal force out | Juryo 6 East vs Juryo 11 East |
| January 1997 | Day 7 | Toyonoumi Shinji | Slap down | Juryo 11 East vs Makushita 1 West |
| May 1997 | Day 4 | Toyonoumi Shinji | Frontal force out | Juryo 10 East vs Juryo 11 East |
| January 1998 | Day 11 | Wakahayato Koji | Frontal force out | Juryo 12 East vs Juryo 3 West |
| March 1998 | Day 9 | Toyonoumi Shinji | Frontal force out | Juryo 8 East vs Juryo 8 West |
| May 1998 | Day 7 | Wakahayato Koji | Beltless armthrow | Juryo 13 West vs Juryo 10 West |
| September 1998 | Day 9 | Wakahayato Koji | Frontal force out | Juryo 10 West vs Juryo 3 West |
| November 1998 | Day 3 | Toyonoumi Shinji | Slap down | Juryo 6 East vs Juryo 8 East |
| January 1999 | Day 12 | Wakahayato Koji | Frontal force out | Juryo 7 West vs Juryo 6 West |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.