(Washington, DC)  --  The Mariners are on a five-game losing skid, after falling last night to the Washington Nationals, 5-1.  Rookie starter Sam Gaviglio had a rough outing for Seattle, giving up five runs on six hits over six innings.  Robinson Cano went three-for-four for the M's with an RBI.  The two teams will finish up their three-game series beginning at 9:05 this morning.