League of Legends Match History

Well this is LotPk, so the requirements for an S game are different from SR. I'm assuming it's the deaths or turret participation. Not entirely sure what the exactly requirements are, but even CS can account for your grade.

Keep in mind the rating system takes your score and play, and compares it to other Ekko players to determine if your play was Great, Above Average, Average, etc. So what may count as S rank in SR won't be the same in LotPk.

Hope that helps. Don't play a lot of the rotating game modes so I wouldn't be able to break down all the factors. SR is really all I know haha.