Haye promises big knockout

BOXING: Britain&rsquo;s David Haye has promised to make history by flooring giant Nikolai Valuev with a &ldquo;jaw-dropping knockout&rdquo;.<br /> <br /> The 7ft Russian has never been taken down in 51 contests, but Haye believes he can end that run in Saturday night&rsquo;s eagerly anticipated WBA heavyweight title fight.<br /> <br /> &ldquo;I truly believe it will be one of the most jaw-dropping knockouts of all-time,&rdquo; said the Londoner.<br />