\begin{tabular}{rrr}
\toprule
&
\multicolumn{2}{c}{foo}\\
\cmidrule(l){2-3}
name&
\begin{tabular}{c}
bar\\
baz
\end{tabular}$\!\!\!\!$&
rank\\
\midrule
x & 1.000 & 4.000\\
y & 2.000 & 5.000\\
z & 3.000 & 6.000\\
\bottomrule
\end{tabular}