Tough call, isn't it? You would think that Moreyball might try to get Mayo, and maybe involve a third team that overvalues the guy. Of course, Memphis might just be overvaluing him, so...
Mayo averaged 20 PPG his rookie season he has potential still. I would trade Lee or Martin (not both) for him straight up.
I would do that in a heart beat, hes only a third of the way through his rookie year but the guys good. That would also make martin more expendable and I would start Lee and let brooks learn or at l;east if the kids willing go under lee's wing and learn defense