Gennady Golovkin vs. Grzegorz Proksa

Golovkin will defend his middleweight world title against European champion Proksa in the main event Sept. 1 of a "Boxing After Dark" doubleheader on HBO at Turning Stone Casino in Verona, N.Y. Golovkin will defend his middleweight world title against European champion Proksa in the main event Sept. 1 of a "Boxing After Dark" doubleheader on HBO at Turning Stone Casino in Verona, N.Y. Golovkin will defend his middleweight world title against European champion Proksa in the main event Sept. 1 of a "Boxing After Dark" doubleheader on HBO at Turning Stone Casino in Verona, N.Y. Golovkin will defend his middleweight world title against European champion Proksa in the main event Sept. 1 of a "Boxing After Dark" doubleheader on HBO at Turning Stone Casino in Verona, N.Y.