According to Mike's video on Planet Destiny, a negative mindset can influence your following games and make you lose more often.
Unfortunately, I couldn't find the original study he talks about but 23% more looses are significant.
Besides all the emotional stuff and girls talk, this is a good reason to control your own feelings and adjust your mindset after a bad match.
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2 RepliesSomeone should tell shesmynerd, he could win like 110% of his games then