Serbia's Novak Djokovic has beaten Andy Murray to the International Tennis Federation's (ITF) annual men's World Champion award with American Serena Williams taking the women's prize for a third time.
Djokovic, who ended a second successive year on top of the ATP rankings, successfully defended his Australian Open title, reached the final at the French Open and US Open and claimed five other titles including the season-ending Tour Finals.
"I am proud to have been named ITF World Champion for the second successive year," Djokovic, who dominated 2011 with three of the four Grand Slam titles, said in a statement on Tuesday.
"It was very difficult to follow up such a successful season in 2011, but it was extremely satisfying to win another Grand Slam title, reach two other major finals and finish the year at No. 1."
The 31-year-old Williams was unstoppable in the second half of 2012, winning Wimbledon, singles and doubles gold at the Olympics and the US Open.
"It means a lot to be named ITF World Champion for the third time. It has been such an amazing experience this year to win the Olympics and two Grand Slam tournaments, and I look forward to having an awesome 2013," said the 15-time major winner.
Dutchwoman Esther Vergeer was named women's wheelchair World Champion for the 13th successive year after winning a fourth Paralympic gold. France's Stephane Houdet won the men's award.
Photographs: Chris Jackson/Getty Images and Vittorio Zunino Celotto/Getty Images
What will Prince William and Kate name their baby?
Athletics federation told to hold re-elections
Bhupathi-Bopanna enter ATP World Tour finale
Dad's ill-health stoked Djokovic's fire in final
Federer charms fans in Murray's backyard