Updates from the evening session on the third dayOsaka and Gauff remain on collision courseAnd email Tumaini here or tweet @tumcarayol 10.48am GMT
Elsewhere, the two other top seeds in action are flitting to victory almost as quickly as Federer now.
Twelfth seed Fabio Fognini is up 7-6(4) 6-1 on Aussie Jordan Thompson and Ninth seed Roberto Bautista Agut now leads Michael Mmoh 5-7 6-2 6-4 *4-1. 10.43am GMT
Second set:
Roger Federer 6-1 4-2* Filip Krajinovic: Krajinovic really could have changed the second set there. After a couple of loose points from Federer including an errant slice under no pressure, Krajinovic found himself up break point and with a big opportunity on his favoured backhand. Instead of burying the short ball and moving the set to 3-3, he sent the ball flying wide as he screamed in frustration. Federer quickly dusted himself off, found his first serve and held. Opportunity gone.