Serena Williams, Flavia Pennetta and Fabio Fognini join Djokovic for charity gala dinner.
Qualifier Peter Gojowczyk and Nicolas Almagro combined for 49 aces.
The big, bad Czech is back in the mix in Russia.
Federer goes formal co-designing new racket.
The Scot is known for his dry sense of humor, for good reason.
Dustin Brown pegs the fun meter with yet another bit of trick shot wizardry
The 29-year-old played to perfection down the stretch to send Argentina to its fifth Davis Cup final.
