at @5:16 mac has his head in his hands..sure thats the final and the moment at 2 sets to 1 up 4-4 adv mac on lendls serve that mac puts a volley just long..wins that one he breaks lendl at 4-5 and serves for 1984 french title....but..he missed.
bit earlier is the famous bit in the final where he shouts into some headphones that were making some noise and getting on his nerves.