Head-to-head · 12 bouts
Asofuji Seiya and Masatsukasa Koshin have met 12 times in recorded sumo. Masatsukasa Koshin leads 8–4.
Asofuji Seiya has won with: over arm throw (2), frontal push out (1), rear push out (1).
Masatsukasa Koshin has won with: frontal push out (3), beltless armthrow (2), hand pull down (1), thrust down (1), head lock throw (1).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| September 2005 | Day 11 | Masatsukasa Koshin | Frontal push out | Juryo 10 East vs Juryo 11 East |
| November 2005 | Day 7 | Asofuji Seiya | Frontal push out | Juryo 11 West vs Juryo 10 West |
| March 2007 | Day 15 | Masatsukasa Koshin | Hand pull down | Juryo 7 East vs Juryo 3 West |
| January 2008 | Day 1 | Masatsukasa Koshin | Frontal push out | Juryo 10 East vs Juryo 10 West |
| March 2009 | Day 13 | Masatsukasa Koshin | Thrust down | Juryo 5 East vs Juryo 13 West |
| November 2009 | Day 7 | Asofuji Seiya | Over arm throw | Juryo 1 East vs Juryo 3 East |
| January 2010 | Day 1 | Masatsukasa Koshin | Frontal push out | Juryo 6 East vs Juryo 6 West |
| March 2010 | Day 11 | Masatsukasa Koshin | Beltless armthrow | Juryo 2 East vs Juryo 4 East |
| May 2010 | Day 3 | Masatsukasa Koshin | Beltless armthrow | Juryo 5 East vs Juryo 6 East |
| July 2010 | Day 8 | Asofuji Seiya | Over arm throw | Juryo 9 West vs Juryo 3 West |
| November 2010 | Day 7 | Masatsukasa Koshin | Head lock throw | Juryo 4 East vs Juryo 5 West |
| January 2011 | Day 13 | Asofuji Seiya | Rear push out | Juryo 8 East vs Juryo 4 West |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.