EUGENE — Ryon Healy went 3-for-5 and matched a career-high with four RBIs to lead No. 15 Oregon to a 12-4 win over Cal State Northridge in a non-conference game on Monday night at PK Park. The Ducks (9-3) broke open a tight game with five runs in the bottom of the eighth inning. Healy delivered the key blow, a one-out bases-loaded double that scored three after the Matadors intentionally walked Ryan Hambright to get to Oregon’s leading hitter. Steven Packard, who went 2-for-5 with two RBIs, added a two-out two-run double late in the inning, giving the Ducks an …