Craig Jones' weigh-in kiss might be a tactic other fighters should pick up ... 'cause he took down Gabi Garcia after planting the smooch on her pre-match.
The Australian grappler dominated his 6'2" opponent from the opening bell ... though she drew out the fight a little before finally tapping out in the second round of the intergender bout.
GG -- who's mulled over an intergender battle like this for years -- has multiple gold medals and world championships in the sport .