in Fed-Djoko's 29 matches (yes more than Fed-Nadal's 28 matches now and they approach to the numbers of matches in the H2Hs between Becker and Edberg or Lendl and McEnroe
), there have been quite a lot of 7-6 and 7-5 (30 ones in 29 matches that's quite a lot in my eyes) ... and there have been more 7-5 scores than 7-6 !!
which means that when they went to 5-5 the probability of a break in next two games is high.
Part of it is Djokovic being a great returner rather than a great server imo (as I've often said Djokovic and Murray are rather return-oriented, Fed and Nadal more serve-oriented, which means that their stats show that there will be more breaks in Djokovic's and Murray's matches),
part of it is that a lot of mental things happened in those moments.
But so far these sets have been quite tied :
- 9-7 for Fed for scores with the score 7-5 (it was 9-6 before the WTF, yes)
- 7-7 in tiebreaks (Djokovic had won the first 3 ones in 2007, he was the one who broke the 2 longest Fed's tiebreak winning streaks, since then it's been 7-4 for Fed - 7-3 before the WTF)