Ozzy used to do that all the time, and still does every now and then. I taught him to bring the ball to me with Sania, our ball-crazed lab. She brings it right back to me every time.
I will not go after the ball for Ozzy. If he wants me to throw his ball, he has to put it where I can reach it, no problem. Sania was like a 'teaser' to him. If his ball was out of my reach, I wouldn't bother with it. I'd throw Sania's ball, and he'd see her playing, so he'd get his ball and drop it right next to me.
He still sometimes drops it behind me though. It doesn't bother me, as long as I can reach it without having to get up.
ETA: When I don't have Sania with me (which is seldom now), we'll just sit there until he brings the ball to me. He eventually gets bored and will give it to me. When he does, he stalks his ball, pounces on it, and I say, "Get the ball!" So hopefully he'll be able to do it on command here pretty soon. lol
Ozzy - Chocolate Pom
-Fastest 2012/2013 U-FLI Pomeranian
"In a perfect world, every dog would have a home and every home would have a dog."