Seattle prevented, at least for one more day, the Angels from clinching a playoff berth. One win by the Angels or one loss by the Mariners will give Los Angeles the American League West title.
Washburn (10-15) allowed five hits over seven innings, and Morrow came on to retire all six men he faced.
Adrian Beltre ignited a four-run sixth inning with an RBI double.
The loss went to Joe Saunders (8-4), who surrendered five runs on nine hits in 5 2/3 innings.