Oscar De La Hoya tells TMZ Sports ... Conor McGregor won't connect ONE SINGLE SHOT during his fight with Floyd Mayweather. \nNot one.\nHe's serious.\nOscar has been a loud opponent of the fight from the start -- saying boxing fans should focus on world-class matchups like Canelo vs. GGG and Miguel Cotto vs. Yoshihiro Kamegai.\nBut get this, despite his war of words with Dana White -- ya know, when Dana cussed him out -- Oscar says the two have buried the hatchet. "That's my man. There's no tension whatsoever."\nCheck out the "TMZ Sports" TV show weeknights on FS1.