Linux/UNIX command line help! I need to find the command to display the following (what is highlighted below)

Here is my directory called sports with files named baseball, football, golf, soccer, tennis, and volleyball.

Here, I dispay the files by using ls

It's asking me to display all the files that begin with 4 characters followed by "ball". How do I do this?

[ata687@ofr-lapegledi sports]s 1s baseball football golf socce tennis volleyball [ata687@ofr-lapegled1 sportsls