Remove one line after TOC title

Is there a way to remove a line between the "Content" title and the first chapter of the TOC? If that helps, here is my doc's specifics.

\documentclass[11pt, letterpaper, doublespace, openany]{report}

\newpage
\maketitle
\newgeometry{top=1in,bottom=1in,right=1in,left=1.5in}
\vspace*{-0.9in}

\tableofcontents

\chapter{Theoretical Background}


• My problem is that, I don't know what is the specific vspace length that corresponds to one line based on my font size and on the fact that my document is double spaced.
– D_C
Jan 17 '18 at 15:30
• tocloft seems to be the package you should look into, i found out as much with 2 google searches... do your research before asking ;) Jan 17 '18 at 15:33
• Yes, I already know about this command and it works. But I don't know what is the exact vertical space (pt) I have to remove. How many pt correspond to one line in my case? \setlength\cftaftertoctitleskip{-10pt}
– D_C
Jan 17 '18 at 15:47

Using the tocloft package, you can substract the the equivalent of one line by doing

\addtolength{\cftaftertoctitleskip}{-\baselineskip}


\documentclass{report}

\usepackage{tocloft}

\begin{document}

\tableofcontents

\chapter{Theoretical Background}

\end{document}