If I die in the middle of the game and leave the game, will I still get a win for that game if my team were to continue without me and win the game?
No, you don't.
I ragequit a match early while two friends were still alive. They later turned out to have won the match, however, I didn't see any win stat show up in my profile. Also to note, the "last match" result didn't show me receiving a win either.
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4You are not necessarily the champion in the next game because you won last game – XtremeBaumer Feb 15 '19 at 9:51