The 32-year-old won 78 out of her 82 matches, procuring 11 titles including the US Open and the French Open in the 2013 season, reports Xinhua.
She had earlier become the oldest world No.1 in WTA history. It is the fifth time Williams has been named the WTA Player Of The Year. She had received the honour in 2002, 2008, 2009 and 2012.
SRK-Gauri anniversary: B-Town stars and their non-filmi better halves
Birthday special: Popular mothers and daughters in Bollywood
Spotted: 'Kaabil' star Hrithik Roshan with dad Rakesh Roshan
'Rock On 2' trailer launch: Farhan, Shraddha enthrall audience with live gig
Photos: Deepika Padukone, Sushmita Sen with daughters at Mumbai airport