Looking on the internet deeply has found these results:

if that the case is the most popular phrase on the web.

if that's the case 119,100,000 results on the web	if that the case 152,900,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Because, you know, if that's the case, and you're just waiting for visa back home... Because if that's the case, there's other ways to do it than moving Boyd in. And if that's the case, hear me out. Now, if that's the case... And if that's the case, watch your back. Well, if that's the case, I'd like to thank whoever's responsible for getting us out early. Well, if that's the case, then welll just have to reshoot. Maybe he's saving me for something, and if that's the case, I'm going to use it.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

if that's the case

119,100,000 results on the web

if that the case

152,900,000 results on the web

More popular!

Because, you know, if that's the case, and you're just waiting for visa back home...
Because if that's the case, there's other ways to do it than moving Boyd in.
And if that's the case, hear me out.
Now, if that's the case...
And if that's the case, watch your back.
Well, if that's the case, I'd like to thank whoever's responsible for getting us out early.
Well, if that's the case, then welll just have to reshoot.
Maybe he's saving me for something, and if that's the case, I'm going to use it.

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.