Federer is currently 61-8 for 2012. To finish with a winning percentage of 90 or over, Federer will have to go undefeated for the rest of the season and win at least three of the 4 remaining tournaments. This would be an awesome achievement. It would tie him with Borg for most seasons with a winning percentage over 90% (4). Also, amazing that at the age of 31, he would achieve something that Nadal, Sampras, and Agassi never achieved in their career.