There are a lot of fighters who were never the same after fighting GSP. Some of these have nothing to do with GSP but some do. Whatever the reason though, most fighters have a poor record after fighting Georges.
Condit was 28-5 going into the GSP fight and is 2-6 since.
Hendricks was 15-1 going into the GSP fight and is 3-6 since.
BJ was 13-5-1 going into the final GSP fight and is 3-7-1 since.
Alves was 17-5 going into the GSP fight and is 5-7 since.
Serra was 10-4 going into the final GSP fight and is 1-2 since.
Hughes was 42-5 going into the final GSP fight and is 3-3 since.
KOS was 15-4 going into the final GSP fight and is 2-6 since.
Fitch was 18-2-0-1 going into the GSP fight and is 13-4-1 since. (He is one of the only fighters to maintain a good record after fighting GSP.)
Diaz was 28-6-1 going into the GSP fight and is 0-0-0-1 since.
Bisping was 30-7 going into the GSP fight and is 0-1 since.
Shields. He was 26-4-1 going into the GSP fight and is 7-6-1 since.
Hardy. He was 23-6-0-1 going into the GSP fight and is 2-3 since.