documentclass{article}
usepackage[]{wrapfig}
usepackage[]{booktabs}
usepackage[]{blindtext}
setlength{parindent}{0pt} % Without it, all entry below will be indented, which is not desireable for the MWE's purposes.

newcommand{tab}{%
    begin{tabular}{r}
    toprule
    This \ midrule
    is \
    a \
    table \
    bottomrule
    end{tabular}
    }

newcommand{entry}{%
    begin{tabular*}{linewidth}{@{extracolsep{fill}}lr@{}}
        toprule
        a & b \ midrule
        c & d \
        bottomrule
    end{tabular*}
    }

begin{document}
blindtext

begin{wraptable}{l}{0pt}
tab
end{wraptable}
entry

entry

entry

entry

blinddocument
end{document}