Epic match yesterday. So disappointing for Fed when he was serving with 2-match points!
Regarding the window closing for Djok (age -what 32 / 33), or Nadal (same - like 32/33 y/o), it seems like in the Sampras era the 30-yo barrier was considered the end. Not many players from that time survived past age 30, but now the top 3-4 players in world are over 30.
N Djok is probably one of the best conditioned athletes - everything from his conditioning and preparation is science-like; his commitment to diet alone is incredible.