(Traducción de Fate Dojo Q&A en la Comptiq 2005-09)

Q: In the other Type-Moon works, who else besides Arc can fight against Servants?

A: If we're working on the condition of one on one, with an extremely average Noble Phantasm. Generally most of the 27 Ancestors, Kishima Kouma, Aozaki Aoko.
If it's just a defensive fight, but would still be a fight, then Ciel. Shiki (Rakkyo), Shiki (Tsukihime) are no match for Servants....but Ryougi Shiki (3rd personality) might be able to go as far as the Ciel class.