Triple G on Fighting Oscar De La Hoya -- 'Stranger Things Have Happened'

Don't rule out a fight between Oscar De La Hoya and Gennady Golovkin -- 'cause after ODLH called out Triple G last week ... his rep tells TMZ Sports, "Stranger things have happened."

GGG's rep says the boxer is well aware of the TMZ Sports video in which 42-year-old Oscar says he thinks about making a comeback every day -- and has his sights set on Golovkin.

But Gennady didn't take the call out as an insult ... his rep says, "It was a show of respect."

In fact, GGG and De La Hoya came face-to-face just days after the video and had a very friendly exchange ... even taking a picture together (see above).

But get this ... GGG's rep says the boxer is so dominant, he has trouble finding opponents -- "We can't even get guys to return our calls."

So, if Oscar wants a fight, and the money's good enough ... we're told, "Stranger things have happened."