For the University of Hawai'i softball team, a first impression could have a lasting impact.

The Rainbow Wahine open the season against Portland State today in the Oceanic Time Warner Paradise Classic.

If the Rainbows beat the Vikings, who appeared in the NCAA Regionals last year, it could eventually be used in the campaign for an NCAA at-large berth. No. 15 Nebraska and No. 24 Auburn also are in this week's tournament at Rainbow Wahine Softball Stadium.

UH coach Bob Coolen said the Rainbows will play about 52 regular-season games, including an estimated 25 against top-50 teams. To earn strong consideration for an NCAA at-large berth, Coolen figured, the Rainbows would need to win 40 regular-season games, with at least 15 against top-50 opponents.

"That gives you the foot in the door," Coolen said.

The first step is against the Vikings, a blind date for the Rainbows.

"We don't know much about them," Coolen said.

Coolen said his strategy is "to put your No. 1 (pitcher) out there, and hope you're on and they're not. That's how it goes. That's how it is to enter a series blind."

Coolen said Justine Smethurst, who went 16-12 with a 1.89 earned-run average last year, and catcher Kaulana Gould, who moves from center field, provide an experienced battery. Smethurst, who pitched three perfect games last season, has worked on improving her risers, screwballs, curves and change-ups.

In training camp, Gould was "our hottest hitter," Coolen said.

Coolen said All-America first baseman Tyleen Tausaga, who suffered a torn meniscus in her left knee two weeks ago, will open at the designated player. She will remain as the cleanup hitter.

Shortstop Valana Manuma reclaimed the job as lead-off hitter.

Left fielder Brandi Peiler, who hit .329 with nine homers last year, has fully recovered from flu-like symptoms that kept her from practicing last week.

"Other than Tyleen, we're relatively healthy," Coolen said.

Reach Stephen Tsai at stsai@honoluluadvertiser.com.