Ronda wins by armbar, and it's yet another lightning quick one.
Not sure of the exact time, but early in the first round.
The fight ended in under 25 seconds.
Some controversy though: Rousey attacked with what looked like a flying arm bar, and applied pressure. Dalelio yelled/screamed causing Rousey to immediately release pressure. Rousey at that point told referee that Dalelio tapped. The ref stopped the fight. Dalelio then protested saying she did not tap. Apparently, according to the rules, what occurred is something they call a "verbal tap" (if you scream as if in pain during grappling, it is considered the same as tapping out).
Unfortunately not very entertaining fight. I'm ok with an early submission, but it would have been much better without the controversy. The crowd booed when ref stopped the fight.
This is a good result for Rousey who now stands at 3-0-0 pro (and 3-0-0 amateur). Unfortunately it does not do much for promotion of women's MMA in general. (It is unlikely Dana White was impressed with this fight).