Nov 22, 2015 6:31 PM by Associated Press
LONDON (AP) - Novak Djokovic won his fourth straight title at the season-ending ATP finals by beating six-time champion Roger Federer 6-3, 6-4 Sunday.
Djokovic, who won three Grand Slam titles this year and reached the final in the other, capped the best season of his life with another superb display on the tennis court, including winning 16 of the 19 points on his second serve and saving both break points he faced.
Federer beat Djokovic on Tuesday in the group stage, but the 17-time Grand Slam champion made too many mistakes in the final on Sunday. Federer ended up with 31 unforced errors, including 15 from his usually reliable forehand.
He even gave away the final point with his second double-fault of the match.
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