Seriously. If you don't want them to run away then position yourself in open world so that they can't.
I ran away from a fleet of 11 pirates trying to gank me yesterday probably 5 or 6 times (I was alone in a brig). Every time I got in range they immediately hit the attack button. We got into battle, I was probably 800 yards away, so I just sailed away. Their broadsides landed 300 yards short.
All they had to do was position themselves better in OW and they would have had me. They never did.