  For a tournament $H$ with $h$ vertices, its typical density is
$h!2^{-\binom{h}{2}}/aut(H)$, i.e. this is the expected density of $H$ in a
random tournament. A family ${\mathcal F}$ of $h$-vertex tournaments is {\em
dominant} if for all sufficiently large $n$, there exists an $n$-vertex
tournament $G$ such that the density of each element of ${\mathcal F}$ in $G$
is larger than its typical density by a constant factor. Characterizing all
dominant families is challenging already for small $h$. Here we characterize
several large dominant families for every $h$. In particular, we prove the
following for all $h$ sufficiently large: (i) For all tournaments $H^*$ with at
least $5\log h$ vertices, the family of all $h$-vertex tournaments that contain
$H^*$ as a subgraph is dominant. (ii) The family of all $h$-vertex tournaments
whose minimum feedback arc set size is at most
$\frac{1}{2}\binom{h}{2}-h^{3/2}\sqrt{\ln h}$ is dominant. For small $h$, we
construct a dominant family of $6$ (i.e. $50\%$ of the) tournaments on $5$
vertices and dominant families of size larger than $40\%$ for $h=6,7,8,9$. For
all $h$, we provide an explicit construction of a dominant family which is
conjectured to obtain an absolute constant fraction of the tournaments on $h$
vertices. Some additional intriguing open problems are presented.
