I think it's more Tsonga initiated the hug than Nole. Tsonga looks to be
with Nole even after Nole defeated him.
I think they're actually quite good friends
I've seen them chatting and laughing together at Hotels and tounaments along the way, and I guess because Tsonga has a winning record against him, Nole certainly has great respect for his game, and it seems to be mutual. There's a lot of good eye-contact and positivity in that photo I think, and very genuine smiles.