Well, by far the worst match from Federer in 2017 (yes, including the Donskoy match). Credit to RBA for being tactically smart and solid, as usual, but still a bad showing (relatively speaking) from Federer. He was bound to have a bad match and he was lucky to escape today. The day off will be welcomed. The absurd backhand from AO and IW seems to be falling a bit down to earth (I noticed that already on the JMdP match).
Edit: In fact I had only watched the first set. Just saw a long highlights reel for the second set, it was much better than the first. So I may correct my post and say that it was by far the worst half match from Federer in 2017.