ADVANCE FOR WEEKEND OF JAN. 11-12 - FILE - In this June 15, 2011, file photo, Serena Williams, left, warms up on a practice court as her father Richard Williams looks on before her second-round single tennis match at the Eastbourne International grass court tournament in Eastbourne, England. Serena sought a little bit of extra guidance from a tried and trusted source closer to home, spending time in the offseason with her father to fine-tune parts of her game that she thought needed improving even after a 78-4 run in 2013. (AP Photo/Sang Tan)