Defenders 1 -- for their first couple years they really were Marvel's top team; in the summer of 73 they beat the Avengers (as a kid I kept careful tallies on each individual battle in the "War", and the non-team won decisively)


Four wins versus two fights to a draw; yep, the Defenders won that. Some of the "victories" were hardly decisive (Swordsman was shot in the back by a criminal while he fought Valkyrie; Silver Surfer and Hawkeye ran away while Vision and Iron Man were saving innocent lives), but a win is a win.