It will be hard to get any stain to blend across the table surface without doing some work. It will be best to sand off the existing stain/finish and then apply new stain and finish. With that said you could do a light sanding and then rub a matching stain across the table top and see what it does. If it doesn't work then simply do a refinish of the table top.

You can try to touch up bare spots with a medium fine brush, try to draw in grain strokes, pat them and with a light touch wipe and try to blend. If you can use spray gun on low setting to shade area lightly tap on touch up again and wipe lightly.