there were several factors that made borg so good in his prime and most of them were related to his physical attributes and mental strength rather than natural ability or talent unlike mcenroe.If you watch some of borg's old matches on you tube such as pepsi grand slam clash with connors or wimbledon matches with mcenroe or french open v lendl ,vilas,pecci and gerualitis what stands out is his amazing speed and agility arround the court,his stamina as he never even seemed to draw breath,his incredible ability to win the big points and the fact that compared to thers he made so few unforced errors during rallies and finally he had an aura about him that i don't think even sampras or federer even had.
There is no doubt in my mind that connors,mcenroe and some othere had much more natural talent and purer shots but borg more than compensated for this with his other attributes.I agree watching him in the seniors is like watching a diffrent player he is totally unrecognisable as the player he once was maybe due to not having as much natural ability as some others,most of the physical attributes no longer being as important or helpful and also having taken such a long break from tennis for nearly 10 years at one point in time, wheras a much more naturally gifted player like mcenroe has still been able to play to a decent standard.
There is no doubt in my mind that connors,mcenroe and some othere had much more natural talent and purer shots but borg more than compensated for this with his other attributes.I agree watching him in the seniors is like watching a diffrent player he is totally unrecognisable as the player he once was maybe due to not having as much natural ability as some others,most of the physical attributes no longer being as important or helpful and also having taken such a long break from tennis for nearly 10 years at one point in time, wheras a much more naturally gifted player like mcenroe has still been able to play to a decent standard.