60. Wolverine vs. Sabretooth (Mutant Massacre)
This is the second Wolverine vs. Sabretooth fight on the countdown (here is the first one).
After the Marauders slaughter a great deal of the Morlocks during the so-called “Mutant Massacre,” the X-Men show up and save a bunch of Morlocks, but suffer great casualties themselves, forcing them to retreat back to the X-Mansion. Wolverine and Sabretooth have their first tangle in the tunnels when Wolverine is attempting to save the Morlock Healer who, naturally, would come in handy in a Mutant Massacre, so Sabretooth is attempting to kill the Healer.
Wolverine manages to drop a wall on Sabretooth and escape with the Healer.
Sabretooth, though, manages to track them back to the X-Mansion. After he takes out Rogue, Psylocke (just a guest of the X-Men at that point in time) has a memorable fight where she takes on Sabretooth and acquits herself pretty well until Wolverine shows up to have a rematch of their tunnel match.
At this point the rest of the X-Men show up and Magneto could obviously end the fight pretty easily, but Psylocke asks him not to, because she can only get past Sabretooth’s mental defenses if he is distracted, which he is while fighting Wolverine. Magneto agrees, and Wolverine and Sabretooth have a memorable tussle.
The fight ends when Wolverine reveals that Sabretooth has been conned - the rest of the X-Men show up to capture him, but Sabretooth escapes by jumping off of a cliff to the lake below.
The X-Men then officially make Psylocke a member of the team.