They will next face off againstTeam VitalityandNatus Vincere, respectively, for the two spots in the grand finals.
Spirit will notably be gunning to become IEM Katowice champions in back-to-back years.
The MongolZ then won round 24 to force overtime.
BLitz also had an excellent map, recording 29 frags and 11 assists on a map-best 18 deaths.
