Djokovic was mentally and physically exhausted. He realized in the very beginning that he can't keep up with the long rallies due the legs, so he just decided to go net from literally every chance. Kudos to Nole for doing something like that, atleast trying where most of the people would have just kept hanging around and prob not getting anything done. He isn't even that good on the net, but was the only option i guess.
Too tough year, tough summer and tough olympics and everyone expecting him to make it 4 slams in a calendar year. I'd have loved to see the history, but fuck Medvedev is great. Next season going to be interesting to see Djokovic, Medvedev, Tsitsipas, Zverev + Alcaraz on clay. It's not easy for Djokovic anymore. Could it even be that all of them stays at 20 slams? The best chance for Nole is in wimbledon, considering most of today's players doesn't know how to play on natural surfaces, minus couple guys on clay. Grass is totally unknown for them.