OG il a very important competition for all athletes, some tennis players don't understand that, it's a pity . A gold medal is such a great accomplishment I guess Federer would exchange one of his GS for a gold medal before retiring, he often said it was a main goal for him, Nole must want it too.
Tomic prefers to defend his challenger's title than to play OG...it's his decision but I think he hasn't understood what is important or not in sport. Nobody will recall who won a challenger, everybody still remember Andy, Kim and Judy crying all together after Andy's win in 2012