The combat log doesn't help that much. You can have 6 first strikes and loose them all, and then they win 3 rounds after that (so they win a total of 9 rounds in a row). The first entry in the combat log with be the first win against you where you took damage.
So in this example, for having 6 first strikes, all you would see is 3 rounds where you lost them all - the 3 rounds where your damage was reduced each round. In other words, the combat log doesn't record failed first strike rounds. So, even though you have first strikes, the enemy may win the first round and "draw first blood" in the combat log.
The only clue you have when viewing the combat logs is that you may notice you winning more of the first rounds, but that is *only* if you have a substantial amount of first strikes. Having one first strike really wont show. If you have 6 first strikes, then you may see the first 3 entries as you winning and doing damge (and thus loosing the other 3). Essentially, the more first strikes, the greater the chance of "drawing first blood".
I don't know if this is still reported the same way in 1.61. It would be good if it told you that the round was a first strike round, whether win or loose. Pre 1.52 or 1.09 had it so that if you lost a first strike round, it would still show in the combat logs, but it show that you didn't loose any HP.
Watiggi