ATP Finals: Novak Djokovic to face Roger Federer in final

    By Ravi Ubha, CNN

    Updated 2248 GMT (0648 HKT) November 21, 2015

    Novak Djokovic remains on course for a fourth straight title at the World Tour Finals after beating Rafael Nadal 6-3 6-3 in London.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Novak Djokovic remains on course for a fourth straight title at the World Tour Finals after beating Rafael Nadal 6-3 6-3 in London.
    Hide Caption
    1 of 30
    Nadal, despite his recent upturn, can't figure out a way to defeat Djokovic. He's lost eight of their last nine meetings.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Nadal, despite his recent upturn, can't figure out a way to defeat Djokovic. He's lost eight of their last nine meetings.
    Hide Caption
    2 of 30
    Indeed he must be wondering what he has to do to finally beat Djokovic.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Indeed he must be wondering what he has to do to finally beat Djokovic.
    Hide Caption
    3 of 30
    Djokovic meets Roger Federer, left, in a repeat of the 2014 final -- though the Swiss pulled out with a bad back last year. Federer on Saturday breezed against fellow Swiss Stan Wawrinka 7-5 6-3.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Djokovic meets Roger Federer, left, in a repeat of the 2014 final -- though the Swiss pulled out with a bad back last year. Federer on Saturday breezed against fellow Swiss Stan Wawrinka 7-5 6-3.
    Hide Caption
    4 of 30
    Rafael Nadal celebrates after he beat David Ferrer 6-7 (2-7) 6-3 6-4 at the World Tour Finals Friday. He ended the group stage 3-0.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Rafael Nadal celebrates after he beat David Ferrer 6-7 (2-7) 6-3 6-4 at the World Tour Finals Friday. He ended the group stage 3-0.
    Hide Caption
    5 of 30
    Ferrer slumped to 0-3. But he had his chances. Leading 4-3 in the third, he couldn't convert when up 30-0 on the Nadal serve in the eighth game.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Ferrer slumped to 0-3. But he had his chances. Leading 4-3 in the third, he couldn't convert when up 30-0 on the Nadal serve in the eighth game.
    Hide Caption
    6 of 30
    Nadal improved to 24-6 against Ferrer and took a 5-4 lead on hard courts.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Nadal improved to 24-6 against Ferrer and took a 5-4 lead on hard courts.
    Hide Caption
    7 of 30
    Up next for Nadal in the semifinals is world No. 1 Novak Djokovic. Djokovic, the defending champion, has won seven of their eight previous matches.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Up next for Nadal in the semifinals is world No. 1 Novak Djokovic. Djokovic, the defending champion, has won seven of their eight previous matches.
    Hide Caption
    8 of 30
    Stan Wawrinka, right, clinched second in the group after beating Andy Murray 7-6 (7-4) 6-4. Wawrinka now faces Roger Federer in a repeat of last year's semi won by Federer in three dramatic sets.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Stan Wawrinka, right, clinched second in the group after beating Andy Murray 7-6 (7-4) 6-4. Wawrinka now faces Roger Federer in a repeat of last year's semi won by Federer in three dramatic sets.
    Hide Caption
    9 of 30
    Roger Federer had already qualified for the semifinals at the World Tour Finals before he faced Kei Nishikori Thursday. But he still prevailed 7-5 4-6 6-4 in a pulsating contest.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Roger Federer had already qualified for the semifinals at the World Tour Finals before he faced Kei Nishikori Thursday. But he still prevailed 7-5 4-6 6-4 in a pulsating contest.
    Hide Caption
    10 of 30
    Nishikori trailed by a break in each set, including being down 4-1 in the third. But he kept things close.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    Nishikori trailed by a break in each set, including being down 4-1 in the third. But he kept things close.
    Hide Caption
    11 of 30
    He was let down by a double fault in the last game on game point. Nishikori was eliminated after making the semis last year.
    Photos: Can anyone stop Novak Djokovic at the World Tour Finals?
    He was let down by a double fault in the last game on game point. Nishikori was eliminated after making the semis last year.
    Hide Caption
    12 of 30