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Novak Djokovic and Serena Williams named 2015 ITF World Champions after winning 3 Grand Slams

  • FILE - In this May 12, 2014, file photo, Serena Williams arrives for a news conference ahead of her participation in the Italian Open tennis tournament in Rome. U.S. soccer hero Carli Lloyd, UFC star Ronda Rousey and Williams were the top three vote-getters for The Associated Press 2015 Female Athlete of the Year award. The AP announced the three leading candidates Monday, Dec. 21, 2015. The winner will be announced Friday.  (AP Photo/Riccardo De Luca, File)

    FILE - In this May 12, 2014, file photo, Serena Williams arrives for a news conference ahead of her participation in the Italian Open tennis tournament in Rome. U.S. soccer hero Carli Lloyd, UFC star Ronda Rousey and Williams were the top three vote-getters for The Associated Press 2015 Female Athlete of the Year award. The AP announced the three leading candidates Monday, Dec. 21, 2015. The winner will be announced Friday. (AP Photo/Riccardo De Luca, File)  (The Associated Press)

  • FILE - In this Tuesday, Dec. 8, 2015 file photo, Serena Williams of the Philippine Mavericks returns a shot to Australia's Samantha Stosur of the Indian Aces during the women's singles in the  2015 International Premier Tennis League at the Mall of Asia Arena at suburban Pasay city south of Manila, Philippines. Serena Williams was all set to put an emphatic capper on her remarkable career. After winning the first three majors of the year, she reached the semifinals of the U.S. Open on the cusp of the first tennis Grand Slam in nearly three decades. The only two players standing in her way were a pair of unheralded Italians. But Williams was stunned in the semifinals by 43rd-ranked Roberta Vinci, which left us all feeling a bit like Drake when that hotline don't bling anymore. (AP Photo/Bullit Marquez, File)

    FILE - In this Tuesday, Dec. 8, 2015 file photo, Serena Williams of the Philippine Mavericks returns a shot to Australia's Samantha Stosur of the Indian Aces during the women's singles in the 2015 International Premier Tennis League at the Mall of Asia Arena at suburban Pasay city south of Manila, Philippines. Serena Williams was all set to put an emphatic capper on her remarkable career. After winning the first three majors of the year, she reached the semifinals of the U.S. Open on the cusp of the first tennis Grand Slam in nearly three decades. The only two players standing in her way were a pair of unheralded Italians. But Williams was stunned in the semifinals by 43rd-ranked Roberta Vinci, which left us all feeling a bit like Drake when that hotline don't bling anymore. (AP Photo/Bullit Marquez, File)  (The Associated Press)

  • FILE - In this June 5, 2015 file photo Serbia's Novak Djokovic stretches to return the ball to Britain's Andy Murray, right, during their semifinal match of the French Open tennis tournament at the Roland Garros stadium in Paris, France. (AP Photo/Francois Mori, file)

    FILE - In this June 5, 2015 file photo Serbia's Novak Djokovic stretches to return the ball to Britain's Andy Murray, right, during their semifinal match of the French Open tennis tournament at the Roland Garros stadium in Paris, France. (AP Photo/Francois Mori, file)  (The Associated Press)

Novak Djokovic and Serena Williams have been named ITF World Champions for 2015, after both players won three Grand Slam titles this year.

Djokovic won the Australian Open, Wimbledon and the U.S. Open, amassing a career-best total of 11 titles in 2015 and an 82-6 win-loss record.

Djokovic, who has now won the ITF World Champion title five times, says "my season was the best of my career."

Williams took the Australian Open, the French Open and Wimbledon, holding all four Grand Slam titles before losing in the U.S. Open semifinals. She ended the year with a 53-3 win-loss record.

Williams won the ITF title for the sixth time and says "it has been an amazing year."