A Complete Directed Graph. A so-called Score Sequence can be associated with every tournament. Every tournament contains a Hamiltonian Path.
See also Complete Graph, Directed Graph, Hamiltonian Path, Score Sequence
References
Chartrand, G. ``Tournaments.'' §27.2 in Introductory Graph Theory. New York: Dover, pp. 155-161, 1985.
Moon, J. W. Topics on Tournaments. New York: Holt, Rinehart, and Winston, 1968.
Ruskey, F. ``Information on Score Sequences.''
http://sue.csc.uvic.ca/~cos/inf/nump/ScoreSequence.html.