GEORGE KAMBOSOS JR was the right hand that he dropped Teofimo Lozano with. It was a hit and a hope.
Lopez, 23, was knocked out by Kambosos (28), in round one in their fight for the lightweight title in New York.
He then won the WBA, IBF and WBO 'Franchise’ belts with a stunning upset.
Kambosos saw the early knockdown as what set the wheels in motion.
BOXRAW uploaded a clip showing Lopez practicing the overhand right.
Kambosos later said: "I set him up beautifully. It was not a lucky shot. It took many months to get that shot up. That shot was being worked on.
Devin Haney will defend his WBC title against JoJo Diaz. The champion has also been able to get up from the deck in round ten.
Eddie Hearn, Haney's promoter, wants to organize a huge undisputed title fight against Kambosos if Diaz, 28, beats the American.
FREE BETTING: Get the Latest Betting SIGN-UP Offers and Free BetsBoxing Social was told by Hearn that it was a spectacular performance.
"He just beat Teofimo who beat Lomachenko. George deserves respect and credit. Right now, however, he is the man. It's okay to say it.
"Devin Haney, my man, but huge respect for George and his father. Right now, George is the man. He has the outstanding victory in the division.
"And this Devin win this Saturday will be another outstanding victory, and then they must me."
George Kambosos Jr beat Teofimo Lopez