Already having the best season of his life and with only one more match to play this year, Novak Djokovic still has a chance to make some history.
The top-ranked Serb defeated Rafael Nadal, 6-3, 6-3, on Saturday in the semifinals of the ATP finals in London. Another win on Sunday against Roger Federer would make Djokovic the first person to win four straight titles at the season-ending tournament for the top eight players in the world.
“Regardless of the outcome of tomorrow's match, the season will still be the best that I had,” said Djokovic, who won three of the four Grand Slam titles in 2015 and reached the final in the other.
Federer, a six-time champion,...