This is how I had scored the fight (I'm neither a GSP or Hendricks fan):
Round 1 | 10-10 Draw
1st Minute: GSP; takedown, guillotine attempt
2nd Minute: Hendricks; punch/elbow while defending takedown.
3rd Minute: Hendricks; takedown, clinch
4th Minute: GSP; striking
5th Minute: Draw; clinch, striking
Round 2 | 10-9 Hendricks
1st Minute: Hendricks; striking (wobbled GSP)
2nd Minute: Hendricks; striking, clinch
3rd Minute: GSP; striking
4th Minute: GSP; striking
5th Minute: Draw; striking
Round 3 | 10-9 GSP
1st Minute: Draw; striking
2nd Minute: GSP; striking
3rd Minute: Draw; striking
4th Minute: GSP, striking
5th Minute: Draw; clinch
Round 4 | 10-9 Hendricks
1st Minute: GSP; striking
2nd Minute: Hendricks; top control, short elbow cut after GSP slipped/tripped
3rd Minute: Hendricks; striking
4th Minute: Hendricks; striking, clinch
5th Minute: Draw; clinch
Round 5 | 10-9 GSP
1st Minute: Draw; takedown attempt
2nd Minute: GSP; striking, takedown
3rd Minute: Draw; clinch
4th Minute: GSP; striking
5th Minute: GSP; clinch, takedown
48-48 Draw
It really comes down to how you score the first round (which then comes down to how much weight you give an elbow vs. a guillotine); the remaining four rounds are really easy to score.
This is what GSP's face looked like after the
Diaz fight (which GSP dominated), which is why you can't judge a fight based on superficial damage.