I NEVER lost to any of my friends on NBA 2K7. I'm talking beating 90s all-stars with the pre-Rose Bulls kinda stuff. I was unstoppable with Hinrich and Sefolosha making a dozen 3's a game. I retired from that game undefeated.
Other than that, tying the Bulls win record in MyPlayer with the Nuggets in 2K11 was awesome. Plus I got a platinum trophy for AC2.