KSW welterweight champion Robert Soldic (18-3) seeks the second defense of his title when he takes on Czech challenger Patrik Kincl (24-9). Promotion officials recently announced the bout will headline KSW 63 , which takes place Sept. 4 at ATM Studio in Warsaw, Poland. The card streams live on KSWTV.com. Soldic, 26, returns to 170 pounds following a one-fight move to middleweight, where he scored a first-round stoppage over Michal Materla at this past November’s KSW 56.