With most of the favorites through, the matches are going to be more closely contested from here on out. Unsurprisingly, there were a lot of draws today, and some were quite short - apparently some players have decided to save energy and make their big push in the rapid playoffs in a couple of days.
That's not at all to say that no one tried; far from it, and the ultimate fighter today was Vassily Ivanchuk, who with Black squeezed Evgeny Alekseev for 97 moves until a blunder finally popped out and he won. Other big guns collecting the full point were Vugar Gashimov (I annotate this game), Teimour Radjabov and Alexander Morozevich. Some 2700s lost, too, including Alexei Shirov (to Vladimir Potkin - I've annotated that game), Etienne Bacrot (to Anton Filippov), and - in unbelievable fashion - Francisco Vallejo Pons, to Lazaro Bruzon. That one almost has to be seen to be believed, so that game also appears in the annotated game link.
All the Americans (and all the "honorary Americans" as well) drew their games.
Links: Official site (with excellent live video coverage) here, Wikipedia brackets here (scroll down), and the three games I annotate are here. (Real annotations, too, at one point verging on the Hübnerian. You're welcome.)