Tsunami has one of the sports most misleading records. She's genuinely world class and is a former WBA female Super Flyweight champion. In recent years he record has become "messy" as she's fallen from 17-3 (6) to 21-10 (10) however she has been really unlucky in a number of those losses, including very close losses to Arely Mucino, Zulina Munoz and Jessica Chavez. Many of those recent losses have come on the road with 6 of the 7 recent defeats coming in Mexico, to really top drawer fighters.
As for Rodriguez, Chile's first ever boxing "world" champion, this will be her third defense of the title. She won the belt in May 2014, narrowly out pointing Janeth Perez in Mexico, and has twice defended it at home in Chile. Although unbeaten her last 3 bouts have all been very majority or split decision and it seems clear that although talented she lacks power.
Although this will be a big ask for Tsunami, especially considering she's going to Rodriguez's homeland, we don't see her being intimidated by the crowd and this is a really good opportunity for the veteran to become a 2-weight world champion, and turn her faltering career around.