  Topological properties and topological superconductivity in real materials
have attracted intensive experimental and theoretical attention recently. Based
on symmetry analysis and first-principles electronic structure calculations, we
predict that $R$RuB$_{2}$ ($R$=Y, Lu) are not only topological superconductor
(TSC) candidates, but also own the hybrid hourglass-type Dirac ring which is
protected by the nonsymmorphic space group symmetry. Due to the band inversion
around the time-reversal invariant $\Gamma$ point in the Brillouin
zone,$R$RuB$_{2}$ also have Dirac topological surface states (TSSs). More
importantly, their TSSs on the (010) surface are within the band gap of bulk
and cross the Fermi level, which form single Fermi surfaces. Considering the
fact that both YRuB$_{2}$ and LuRuB$_{2}$ are superconductors with respective
superconducting transition temperatures ($T_c$) of 7.6 K and 10.2 K, the
superconducting bulks will likely induce superconductivity in the TSSs via the
proximity effect. The ternary borides $R$RuB$_{2}$ may thus provide a very
promising platform for studying the properties of topological superconductivity
and hourglass fermions in the future experiments.
