The title is of course "click bait",I employed it because Mendoza does so when describing the fact that Gun Boat Smith floored Jack Johnson in a sparring match whilst Johnson was training to face Ketchel. However Corbett did floor Jeffries in sparring, it happened on Feb 27th 1897 at Corbett's training camp whilst he was preparing to fight Fitzsimmons. " Corbett dropped and badly dazed Jeffries with a short right. Billy Woods replaced him and despite he was wearing the pneumatic armour*,even Woods was knocked groggy and dropped by body blows." Source "In the Ring With Bob Fitzsimmons," by Adam Pollack page 350. * The "armour" was an early prototype of head protector leather and stuffed with hair. I was amazed by Corbett's speed,cleverness,and hitting power.He never missed a chance,and his feints completely dazzled the Los Angeles pugilist[Jeffries]. " He dropped Jeffries this morning with the shortest of short arm punches,and he doubled Woods up and floored him with the left body blows." Charley White Trainer. Sources The San Francisco Chronicle & The New York Journal Feb 28th1897. An eye witness to the knockdown was WW Naughton Editor of The Police Gazette, and writing in the San Francisco Examiner,March 15th 1897. " I saw him send big Van Buskirk down with a half speed right at the Olympic Club a few months ago,and I saw him drop Jeffries with a right jolt not many days since". So primary sources verify that Corbett dropped Jeffries in sparring. My intention is not to make cheap capital out of it,many fighters are floored in sparring and Jeffries was an up and comer at this stage . My object in posting this information is to demonstrate that "sparring is sparring" and it is entirely different to a real fight. For example; Toxie Hall floored Marciano in a spar and the session was called off.Was that then a tko win for Hall ? Of course not! Greg Page floored Tyson with a right hand. Raphael Butler and Travis Walker floored Vitali Klitschko in sparring. Such information is interesting ,but hardly earth shattering or meaningful when it comes to predicting how a real fight would turn out. As I say, I posted the tid bit just to demonstrate how ridiculous Mendoza's claim of Smith scoring a tko over Johnson in a spar are!