"I talked to my coaches about how to go out there and run my best and they said to be confident and run strong throughout," said Rosas, who won the conference crowns for the first time in each event after securing All-American status in each and advancing to the state championship last season. "In the 5K, I tried to go around six minutes per mile and I picked it up in the last couple of miles.
"In the 10K, my coaches told me about mainly being able to pace myself and then take off in the last mile. I was really impressed with it. I just trust my coaches and training. You go out there and put in quality workouts because it all comes down to your mindset."
Rosas will next participate Friday in the 10,000 at the Southern California Championships at Mount San Antonio College.
The top six finishers from each event qualified for the prelims, which will be held Friday at Mt. SAC.
Also, picking up a first-place finish for the Vaqueros was Alyssa Selve. Selve clocked 4:50.75 to take the 1,500 race.
"Alyssa just ran a smart race and she's an excellent runner," Lopez said. "She can continue to do better because she's that good.
"We did well as a team in a lot of the races. We still have to get better in a lot of the field events and we need more weight people."