Yes Ace love to play fetch and he will bring it back, but getting it out of his jaws is a different story.
Usually when he bring it back it then turns into tug of war and I have tried commands such as leave it, give it to me and etc but mostly with meager results.
I have found one way while in the yard to get the ball back when he brings it and that's by holding onto the ball and sticking a pine straw up his butt, he then releases the ball for me to throw again. I don't actually stick the straw up his butt but just feign it and that's usually enough for him to release