In round 7 three of the five games saw a winner, doubling the total of wins through the entire tournament.
One of the players whose game finished in a draw was Fabiano Caruana's. He started the round in clear first with a +2 score and the white pieces against Wesley So. So was better prepared in a 5.d3 Bc5 Ruy and equalized easily, drawing in just 30 moves. (If anything, So was a little better near the end.)
Caruana maintained the lead, but thanks to Ian Nepomniachtchi's win over Viswanathan Anand it's a shared lead. Nepo played an experimental opening hoping for a chance to fight, and he got it. His play wasn't perfect, but he handled the unusual situation much better than Anand did, and won an impressive game.
While Caruana and Nepomniachtchi are the front-runners in this tournament, Magnus Carlsen and Maxime Vachier-Lagrave are the leaders in the overall Grand Chess Tour standings. Both drew their first six games, and both won in round 7. For Carlsen this required some luck early on, as Michael Adams was winning in the opening (with Black against the Bird) and was better in the ending as well. But while Carlsen's initial salvation in the game was a matter of luck, he simply outplayed Adams in the ending. First he stabilized the situation, then he equalized, and then he managed to obtain some counterplay that wound up winning the game.
As for MVL, he won a nice game with Black in the Najdorf against Sergey Karjakin. He had suffered some defeats in the Delayed Poisoned Pawn in the last year or two, but this time he was well-prepared, neutralized White's attacking ideas, and eventually exploited the weaknesses left behind in the wake of White's aggression. He, like Carlsen, is half a point behind the leaders.
Finally, good preparation helped Levon Aronian gain the upper hand against Hikaru Nakamura, but he was unable to convert it into a win. (Or even to cause Nakamura as many problems as Aronian felt his early advantage merited.)
The games, with my comments, are here; the pairings for the penultimate round follow: