Consider the following example:

```
\documentclass{article}
\newtheorem{Theorem}{Theorem}
\begin{document}
\begin{Theorem}
On the other hand, this one has only one claim.
\end{Theorem}
\begin{Theorem}
\begin{enumerate}
\item First claim
\item Second claim
\end{enumerate}
\end{Theorem}
\end{document}

```

Typesetting it results in:

![enter image description here](https://i.stack.imgur.com/owIaT.png)

Notice there is extra horizontal space before the first item in the list of the second theorem.

> 
> Is there a sensible way to get rid of that?
> 
> 
> 

Ideally, the solution would work with `amsthm`, `thmtools`, `enumitem`.

*N.B.:* this is related to [Is it possible to skip the first line in a theorem environment?](https://tex.stackexchange.com/q/8110/525) but not quite the same.