Up 7-1 after 7 1/2 innings, the Rainiers let the Tucson Sidewinders back into the game, allowing four runs in the bottom of the eighth.
But Rob Johnson and Brant Ust each had two-run doubles in thetop of the ninth and the Rainiers won 12-5 in Tucson.
Nick Green led off the game with his third homer and Jeremy Reed had his seventh home run in the fifth.
Tacoma starter Robert Rohrbaugh (1-0) gave up an unearned run on seven hits while striking out two and walking three in six innings.
Sign Up and Save
Get six months of free digital access to The Olympian