Not a lot to go on, but... I seem to remember a guy in a space fighter going out to meet a fleet of alien invaders and somehow avoiding all out war. I also remember something about the guy having a sister and that she was important to the story. It's not Armor, Ender, or Starship Troopers, but it reminds me of them. I think it came out around the same time as In Conquest Born, Neuromancer, Hardwired, Snow Crash, etc. It may have been hard scifi. I don't think it was cyberpunk, but it might have been.
So, the details were a little off, pilot was a girl, not a guy, she wins the battle and defeats the alien wolfpack. I found it the hard way, looking through a few thousand books in Goodreads lists — Chris Claremont's First Flight.