Of all the pro players, who plays on highest ping on average?
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Pretty sure they did a segment a few weeks ago, where they were talking about how Matt from TL played on Hawaii internet with 100 ping that would drop his fps to like 6 or 7 during teamfights. 
For current pros' current ping, all of them have the same ping because they all live in Southern California.
Any pro player that lives in hawaii I guess. However, if you want to go pro, you need a really good gaming rig and wifi to make low ping plays. I don't really know who, but the difference would be a 4-5 ms factor.
Why would it matter?
Guys, I need more specific answers, any real pro players with high ping out there?
130 and below is fine, to humans 130 and below is natural and responsive as soon as it ticks over 130 the human brain starts to notice ''input lag'' if you will.
hope that helps in some shape or form.