User blog comment:Valeth/Archer of SIN/@comment-32751919-20190501131740/@comment-32751919-20190503004309

They actually has a lot of Archer VS Archer, but most of them are either too short to consider as "fight" (Atalanta VS Chiron), or other just completely outmatched by other (Billy, Robin VS Arjuna) or they are ambush each other (Gilgamesh and EMIYA).

I think only time that actual Archer VS Archer is happen is Robin VS EMIYA (and I'm not sure if this is canon in Fate/Extra.)

That the reason why I like Chiron, his skill just completely outmatch Mordred, if not because Mordred are overall more powerful.