Djokovic, Serena named ITF 2013 World Champions
Djokovic captured the men's award for the third straight year, and Williams took the honor for the fourth time.
Djokovic started the year by winning a third straight Australian Open and was runner-up at Wimbledon and the U.S. Open. The 26-year-old Serb finished the season No. 2 in the ATP rankings with seven tour titles.
The 32-year-old Williams won the French Open and U.S. Open in 2013 to end the year No. 1 in the WTA rankings for the first time since 2009.