Tigers 5, Nationals 1: Alex Avila snapped a sixth-inning tie with his first career grand slam as host Detroit extended its winning streak to four games.
Anibal Sanchez pitched seven strong innings and Andy Dirks recorded two hits and an RBI for the American League Central-leading Tigers, who have outscored their opponents 29-6 during their winning streak.
Prince Fielder began the decisive rally with a one-out single and Victor Martinez followed with a double. Two batters after Jhonny Peralta walked to load the bases, Avila launched a 2-1 offering from Stephen Strasburg (5-9) over the right-field wall for his seventh blast of the season and a 5-1 lead.
Sanchez (9-7) held the Nationals to one run and five hits with two walks and one strikeout. The 29-year-old right-hander, who improved to 9-1 lifetime against Washington, has yielded two runs or fewer in seven of his last nine starts.
Ryan Zimmerman drove in the lone run for the Nationals, who had their three-game winning streak snapped.
GAME NOTEBOOK: Strasburg surrendered five runs and six hits over seven innings. It was just the sixth time in 21 outings this year he has allowed more than two earned runs. ... Washington yielded a total of three runs during its winning streak. ... Avila's grand slam was the second in as many games for the Tigers. Peralta belted one in Sunday's 12-4 triumph over Philadelphia.