The Bulgarian is clearly jazzed to make his Nitto ATP Finals Debut
World No. 3 is world-class prognosticator.
Paris Masters champion hopes comfort level will grow.
"I feel like indoors deserves its place," says six-time WTF champion.
Roger Federer doesn't normally do this.
Now we know what former No. 1 has been up to lately.
The Russian will seek the help of a new coach for 2018
