From that current picture of Borg on a clay court, it looks like he switched completely to a two handed backhand. He used to have a hybrid backhand of starting it out with two hands and then letting go of one hand. Does he still hit his backhand like that? I have not seen him play recently.
Prince TT Scream, Prince Topspin 60lbs, Baseline Counterpuncher, Usta 4.0.