Out of curiosity just watched most of Dimitrov´s win against Troicky. First of all, Janowicz and Troicky as rounds one and two of a 250´s... talk about a tough draw.
Dimitrov played just a bit better on set 1 and won it after fending off a few early break points. He was being overplayed on set two and found a way to win. I never put much stock when people say that is what great players do (for me great players play great), but, yes, I see that happen more often than I would like. So, in such a sense, this was a good win for Dimitrov. Once he fended off the innumerous break points in the second set, in I would guess all his first three service games, while Troicky was navigating in 40-0 service games, he stepped up, found a break and never looked back.
It is just the round of 8 of a 250, but still a good sign.