Sorry if this has been discussed before. But Marcos' great run at this year's Wimbledon is not a surprise for those who saw him play in the first week.
He was just having a great time on the court. Even when he was losing his doubles match he made jokes with opponents, umpire and crowd and just enjoyed playing the game.
Since he first appeared on the Tour I have always thought that he must try to maintain this attitude as his career progresses, even if that includes doing silly things in huge matches sometimes. You can see that he usually plays much worse when he puts himself under pressure.
I don't know whether he just likes Wimbledon that much. But it's working again and I hope he can keep this up.