(Photo credit: Justine Willard-Imagn Images) Kayla Thornton buried four of Golden State's 12 first-half 3-pointers in a 56-point explosion that opened a 20-point lead and propelled the Valkyries to a 95-77 victory over the Portland Fire in the teams' Commissioner's Cup opener on Tuesday night in San Francisco. Thornton finished with five 3-pointers in 10 tries and a game-high 19 points as the Valkyries (6-3