It's easy, first display that top 10 select. Under it add another textbox or whatever C2 object you use to display the first 10, so add one under it (i guess it's a textbox).
Make it smaller and assign the following select to it
SELECT
*
FROM scores
where Name = <C2 variable holding his nickname>
This will display one line with the player's nickname, and since you put the textbox under it, it will show as separate.
It is possible to make a select to display everything in the same C2 object but i'm in a bit of a hurry right now. I'll see if I can make that work as well a bit later.