Sent duel time query messages to participants of the matches and duel organizers of the opposing teams regarding round 4. Will update this post after receiving responses.
One message to Evaria, Acsabi44 and Gillero
One message to markilleruk, mithcairion and Avenger
Hello,
Could you tell me if you have already set up a date for your match ? Please reply by today otherwise we can set up subs for the match if needed.
(please reply to all)
Edit1: Considering Evaria hasn't been around for a while and she didn't reply to Acsabi yet, i think we might need to sub for that match. I made a deal with acsabi that we will clear this issue by tomorrow and he seems to be fine to make the match on last day of duel phase.
members, please notify me if / when you are available on the last day of duel phase to sub for Evaria.
Thanks.
No, we have not yet agreed on a time.
I PMed Eva but I got no reply yet.
Acsabi
We are unable to reach Evaria and might have to sub for that match. Please allow us to make this clear by tomorrow so we can complete the match sometime on the last day.
Thanks
No problem.
Acs
Edit2: As for mark's match;
[14:05:54] Mithcairion [»] hainkarga: Hey, I got your PM (not sure why it was sent to Ave, too), and mark and I are working on a time to play right now.
[14:08:21] hainkarga [»] Mithcairion: i sent to ave because he is your duel organiser, much like i am. As long as you are not experiencing any problems with your duel timing with mark, there is no problem. Otherwise i should know to take precaution.
[14:10:16] Mithcairion [»] hainkarga: Ah, gotcha 
Well, mark and I have pretty much opposite schedules, but I gave him a couple of times that should work for the both of us.
[14:16:11] hainkarga [»] Mithcairion: allright, good luck in your match. but not as much luck as mark
