Serbian tennis star Novak Djokovic, in a dream season during which he failed to win only the French Open, and U.S. swimmer Katie Ledecky, who won five world titles, were named 2015 champions of champions by EFE, Spain's international news agency.

Djokovic had an historic season. Not only did he finish at the top of the international tennis rankings for the fourth year out of the last five, but he broke the record for points accumulated with 16,585, almost the same figure achieved by his two closest rivals combined, Britain's Andy Murray and Switzerland's Roger Federer.

His dream season began with the Australian Open, which he won for the fifth time, followed by the Masters 1,000 tourneys at Indian Wells, Miami, Montecarlo and Rome, his third Wimbledon title, second U.S. Open win and a fantastic showing all season on covered courts, with consecutive titles in Beijing, the Masters 1,000 in Shanghai and Paris, finally winning his fifth Masters in London.

The only stain on Djokovic's record this year was at the French Open, losing to Switzerland's Stan Wawrinka after defeating the tournament's king, Rafael Nadal, in the quarterfinals.

The Serb said after defeating Federer in the Masters final in London that his season was "as close to perfection as it can get."

Ledecky, meanwhile, at age 18, had become the undisputed reigning swimming queen, bringing home five gold medals from the World Aquatics Championships in Kazan, Russia.

She also managed to break her own world record in the 800-meter contest by more than 3 seconds and twice break her world record in the 1,500-meter race.

At Kazan, she won gold medals in the 200, 400, 800 and 1,500-meter races, along with the 4x200 relay.