Poland’s KSW is looking to make some history this spring. The promotion is set to host a champion vs. champion event that is poised to be the biggest event in European MMA history. “KSW Colosseum” will take place May 27 at National Stadium in Warsaw, Poland, which can hold 58,000 fans, but may be configured for as many as 65,000 for the card. KSW middleweight champion Mamed Khalidov (32-4-2) will fight KSW welterweight champion Borys Mańkowski (19-5-1) in the main event
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