Ok, I was a little bored...
Standard disclaimer (this is MTF after all) - THIS IS A JOKE!.... or not
All are divisible by 5:
1) Played on the 20th of the month
2) It was Fed's 85th match of the year
3) He would have crossed Muster's 35th win
4) This would have been his 25th straight win in finals.
5) This was the last match of the year 2005
6) It was Fed's 15th ATP tournament of the year (excluding Kooyong and Davis Cup)