Welter Weights Fight.Louisville, Ky.. April 30.-—Matty Mattheys of Brooklyn got the decision last night in the 20-round contest for the welterweight championship of the world over Tom Couhig of Dunkirk. Couhig had the best of the fight up to the eighth round, hut his nose was broken in the ninth and in the 13th he was nearly out. The bout took place at the Buckingham theater under the auspices of the New Monarch Athletic club.