Medvedev secured a spot in the semifinals of the season-ending tournament by dominating five-time champion Novak Djokovic 6-3, 6-3 Wednesday for his second straight win of the group stage. Medvedev, who lost all three of his group matches last year on his tournament debut, has now beaten Djokovic in three of their last four meetings. The top-ranked Serb can still advance if he beats 2018 champion Alexander Zverev in a winner-takes-all match on Friday. » Subscribe to USA TODAY Sports: https://bit.ly/2L0ktE1 » USA TODAY delivers current local and national news, sports, entertainment,  finance, technology, and more through award-winning journalism, photos, videos and VR. #Tennis #ATPFinals #ATPFinals2020