The 19-year-old Croatian hires Mario Ancic's big brother and former coach.
"Why not set up a record that will never, ever be done again in history. And I think she can do it," coach says of Serena.
Former WTA pro made history as first African-American and former pro player to serve as President.
Canadian No. 1 supports American No. 2 in new ad campaign.
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.
