Long version:
Korea vs. Netherlands (12:00 cest, 19:00 korean time, 6:00 east coast)
As every first game viewership begun low but quickly grew and at the half time was at 50k viewers (youtube 10k). Korean stream led the way with 25k folowed by english with 17k. After the half time number of viewers kept growing and
reached 64k. (14k youtube)
Poland vs. Austria (13:20 cest, 20:20 korean time, 7:20 east coast) (how the fuck matt makes barage work every fucking single time?!?!?!?!?!)
Prodably one of the least hyped matches but one that could have been the most competitive. After losing most of korean viewers streams settled at just above 40k viewers. (10k youtube). Throughout match number of viewers grew at a slow but steady pace reaching 45k by the half time and 47k during 2nd half of match and peaked at just under 52k (still 10k youtube). Interesting things is popularity of this match amongst russian viewers (it might be because next match has russia) and number of polish viewers (1.5k)
(as much as i want to see more of japanese players i want some of polish players to make it into pro scene)
Canada vs. Russia (15:20 cest, 22:20 korean time, 9:20 east coast)
Match for which i waited the most (at least before qualifying games). started just little bit lower then where previous game left with 50k viewers but after 1st map number of viewers grew to 70k, a lot of viewers came from russia - 7k viewers comparted to usuall 2k-3k and interestingly from korea - 14k compared to 4k during poland vs australia. (12k youtube). by the time there were 75k people watching (12k youtube) 2nd half of the match begun with around 75k viewers and peaked by the end of the match with 90k. (12k youtube)
Singapore vs. Turkey (17:00 cest, 2:00 korean time, 11:00 east coast)
Arguably least hyped match of the whole tournament. It had aroun 60k viewers throughout whole first half. (10k youtube)During 2nd half number of viewers grew to 65k (12k youtube)
Korea vs. Russia (18:40 cest, 3:40 korean time. 12:40 east coast)
Prodably most anicipated game begun with 70k viewers but soon number of viewers started growing and reached 95k before map 2. (youtube 14k) It kept growing and during map 3 broke 100k viewers and menaged to break day 1 peak with 106k viewers. (youtube 16k)
Canada vs. Netherlands (20:20 cest, 3:20 korean time, 14:20 east coast)
A lot of viewers (specialy korean because it was 3am in korea monday) tuned out after korea vs russia match ended so the game started with "only" 68k viewers. Number of viewers grew just a little bit to 70k (12k youtube) and peaked at 72k viewers.
(ill repeat myself, i dont think any game next weak will have more viewers then this weeks games with korea)
detailed stats for day 1 (repost) (lets ignore with chinese):
https://esc.watch/tournaments/ow/overwatch-world-cup-2017-katowice-qualifier
https://twitter.com/EsportsCharts/status/894153157504364544
here sydney: (lets ignore with chinese)
https://esc.watch/tournaments/ow/overwatch-world-cup-2017-sydney-qualifier
and shanghay (again ignore with chinese viewers):
https://esc.watch/tournaments/ow/overwatch-world-cup-2017-shanghai-qualifier
clearly highest twitch peak was during katowice (and thats for day one only)