I was looking at the top 4 players opponent rankings to see who (on paper so far) has had the tougher draw:
1. Novak's first 3 players were ranked: 109, 56, and 81
2.Nadal: 167, 190, 119. But it should get tougher in the 4th round with either Isner or Lopez.
3. Roger's first 3 players were: 172, 93 (walkover) and 57
4. Seems like Murray (on paper) had the toughest first 3 rounds with his opponents ranked: 77, 101, 46
Just thought it was interesting to see.