Floyd Mayweather got some one-on-one time with Travis Scott at the rapper's wild show in Milan this week ... getting backstage access to the whole concert.
TMZ Sports has learned -- La Flame's team welcomed the boxing legend with open arms at his "Circus Maximus" tour stop in Italy ... making sure to give him the VIP treatment.
MILAN CONCERT
The show was so lit, nearby citizens thought the area was experiencing an earthquake as Scott performed his banger "FE!