Chicago Bulls point guard C.J. Watson wants to make one thing perfectly clear -- he has never ... nor will he ever ... date Floyd Mayweather Jr.'s baby mama ... despite what she told police. As TMZ first reported, Josie Harris told Las Vegas cops that before Mayweather Jr. allegedly attacked her…

Floyd Mayweather Jr. was in a fit of jealousy over a basketball player when he allegedly attacked his baby mama, Josie Harris and threatened to kill the pair ... this according to the police report obtained by TMZ. According to the report, Mayweather read text messages on Josie's phone ... which…