PORTLAND, Ore. (AP) — The National Women's Soccer League is going where no other previous U.S. women's pro soccer league has gone: A fourth season. The NWSL enters its pivotal season starting Saturday, still riding the boost that the sport was given by the U.S. national team's World Cup victory last summer. The United States will go for its fourth straight Olympic gold medal this summer in Brazil, which should also help keep the spotlight on the NWSL — which features the national team's players. "The league's still in the growing stage," said defender Meghan Klingenberg, a newcomer to the Portland Thorns this season.