In an all-American grudge match, Fabiano Caruana defeated Hikaru Nakamura, sacrificing a queen in the 6.Bg5 Najdorf. Now it's hard to believe that Wesley So won't win the Grand Chess Tour as he beat Veselin Topalov as Black today in London. So is still leading the London Chess Classic, with three rounds to go. He'll likely end among the top three in the final leaderboard, and in that case it doesn't matter whether Nakamura wins the tournament or not. The latter is now 1.5 point behind the leader.
https://www.chess.com/news/view/grand-chess-tour-saga-virtually-decided-in-london-6773