You can now search a players game history for only games in the WCS system! On a players Match History page, select the criteria you want to sort by at the lowermost dropdown menu named "WCS Tiers". You can sort by both WCS Tier and the nativity of the event (1st/3rd party organizers). We know this feature has been wanted for a long time, and we are happy to have a front end interface to the WCS system we have had in place for some time now. We will be working on improving the accessability to the data and hopefully add it to the general search page soon™.