Despite his 3 losses to Mac, Borg had a pretty decent 1981. If he had simply taken a break to refresh and come back fully recharged (rather than play 1 off tournaments here and there), could he have won more slams? If you look at the year 2008, for a while it might have seemed that thing were going downhill for Fed. Then 2009 happened. Keep in mind that Borg's losses in 1981 were not all that bad, many went to 5 sets.