Diego Ferreira and Mateusz Rebecki meet Saturday on the main card of UFC on ESPN 56 from Enterprise Center in St. Louis. Check out this quick breakdown of the matchup from MMA Junkie analyst Dan Tom.   Diego Ferreira vs. Mateusz Rebecki UFC on ESPN 56 preview Ferreira (18-5 MMA, 9-5 UFC) and Rebecki (19-1 MMA, 3-0 UFC) compete in the lone lightweight bout on the main card. … Ferreira will look to remain in the win column following a knockout win of Michael Johnson last year, which snapped a three-fight kid. … Rebecki only has one loss on his professional record, which came in just his fourth pro fight.