SEATTLE -- With the bases loaded and on an 0-2 count, Seth Smith mashed his first career grand slam, a 404-footer over the fence in right-center field.That hit put the Mariners up 4-0 in the third inning Sunday en route to a 9-4 win and a four-game sweep of the Orioles.

SEATTLE -- With the bases loaded and on an 0-2 count, Seth Smith mashed his first career grand slam, a 404-footer over the fence in right-center field.

That hit put the Mariners up 4-0 in the third inning Sunday en route to a 9-4 win and a four-game sweep of the Orioles. Smith homered in each of the four games, the longest streak of his career. But in the classic Seth Smith style, he downplayed his achievement.

Grand slams mean 40% off pizza

"[I'm] just trying to put good swings on pitches that are left over the plate and try to take the other ones," he said.

Smith drove in 11 runs and batted .471 with a 1.176 slugging percentage in the series. He contributed to an offense that had 23 extra-base hits, tied for the second most in a four-game series in franchise history.

But if Smith wouldn't talk himself up, third baseman Kyle Seager would do it for him.

"He should," Seager said. "That's pretty impressive. He's been great. He always puts together a professional at-bat, but over the course of the season, you get hot and you get going. And it's been a lot of fun for us to kind of jump on his back."

Smith went on a tear soon after returning from a series in Detroit in which he struggled with timing.

When the team returned home, Smith started working on slowing things down.

"Small adjustment, nothing major," Smith said before Sunday's game. "Just timing. Trying to get ready sooner, just being ready to hit when the ball gets there."

That small adjustment had big consequences.

The Mariners have won seven of their past nine games. They are 43-39, tied with the Astros for second place in the AL West, and headed to Houston to duke it out over a three-game set.