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I wouldn't call it a fluke, although i do think i rematch would go towards FPX. I feel like some good preperation and respect(not ego peeking) gave XSET so many rounds that other teams would have lost. They managed to shut down shao by trading well. FPX also just didn't give XSET enough respect, especially in the breeze game they threw many games just repeeking angles and dying.
XSET also had a good map vito. FPX is well know as a great counter strating team, so the pearl pick from XSET was an expectional choice. They had no idea how XSET plays so they never really had a chance.