Serena Williams and Novak Djokovic were today named the women's and men's players of the year by the International Tennis Federation (ITF).
Both won three of the four Grand Slams in 2015 and are well clear in the world rankings.
Williams, who was named 'ITF World Champion' for the sixth time, won five titles throughout the year, finishing with a 53-3 win-loss record.
After winning Wimbledon in July she also held all four Grand Slam titles at the same time for the second time in her career, which she previously dubbed a 'Serena Slam' in contrast to a calendar Grand Slam.
"It means a lot to me to be named the ITF World Champion for the sixth time. I am proud to have achieved my second Serena Slam, in what has been an amazing year for me," she said in an ITF statement.