Spectrum Sports, Inc. v. McQuillan

After the McQuillans (plaintiffs) refused to give up their athletic sorbothane distributorship, the sorbothane producers (defendants) cut off their supply, gave their athletic distributorship to Spectrum Sports (defendant), and began selling a competing horseshoe pad themselves; a jury found for the McQuillans on their attempted-monopolization claim, and the Ninth Circuit affirmed, holding no market definition was required if anticompetitive conduct was shown.