The world's top three players each had winning positions - clearly winning positions. Guess how many points they scored from them, put together? Answer: one out of three, with two draws and a loss. Magnus Carlsen was on his way to a smooth endgame win against Viswanathan Anand with an extra pawn in a knight ending, Fabiano Caruana had a winning attack on the black side of the Sveshnikov against Ian Nepomniachtchi, and Ding Liren's mighty pawns and attacking prospects gave him more than enough compensation for the sacrificed exchange against Sergey Karjakin.
Amazingly, not one of these 2800+ rated superstars managed to convert their advantages. Carlsen allowed Anand's king to run around behind Carlsen's pawns, securing enough counterplay for the draw. Caruana never managed to settle on a single idea, burned more and more time against Nepo's blitz-like play, and not only lost his advantage but fell apart in time trouble. He lost the game. As a result, Nepomniachtchi is in clear first and solidified his grip on the 4th spot in the world rankings. Finally, Ding's failure against Karjakin was less pronounced than that of the two Cars. For him to convert his advantage, the key was to get rid of Black's light-squared bishop. His not doing that allowed Karjakin enough counterplay to force a repetition.
The other three games (Aronian - Giri, So - Vachier-Lagrave, and Nakamura - Mamedyarov) were relatively uneventful draws.
The games (no notes - the blown opportunities make it too depressing) are here, and here are the pairings for round 3: