This weekend, the four quarterfinal matches will be streamed with commentary. Here is the info for each match:

Saturday at 15:00 UTC with commentary from Philip and E.Honda
Mercury444F (4) vs Sicomatic (12)

Sunday at 0:00 UTC with commentary from funkdoc and vsiewnar
SamE (40) vs LazyDog (81)

Sunday at 20:00 UTC with commentary from Stef and aku_chi
Dan Brooks (2) vs gamesou (58)

Sunday at  with commentary from  (will update as details become available)
jsh357 (19) vs Skies (59)

Keep in mind that your offset from UTC may be changing by an hour between Saturday and Sunday due to daylight savings.

All the matches can be watched at twitch.tv/dominionstreams