Round one begins and Esparza rushes in and lands a nice right hand over the top. Both women are swinging wildly early on here. Both ladies connect with right hands. Esparza scores with a hard low kick and then circles out. Calvillo leaps in and scores with a double leg takedown. She immediately moves to half guard and begins working some short shots. Esparza is throwing more from her back at the moment but Cynthia is working on trying to advance her position. Esparza is able to get back to full guard and then throws up an armbar attempt. Calvillo could be in trouble here. Esparza cranks the hold but Cynthia moves and breaks free. Calvillo instantly passes to side control and begins working some elbows. Still, Esparza continues to land a lot of shots from her back. Calvillo moves to mount and then tries to take the back. Esparza scrambles and winds up in top position. She lands a couple of shots before the horn sounds to end round one.