ARLINGTON, Texas -- Texas has stayed in the American League West race with its solid play against division foes.
The Seattle Mariners may have fallen out of postseason contention because of their inability to win against their rivals.
Carlos Lee also drove in three runs for Texas, which won its fifth straight game and remain five games behind division-leading Oakland in the AL West. The Rangers have scored 51 runs during their winning streak.
Texas improved to 19-14 within its division -- including an 8-2 mark against Seattle.
"We're playing a good brand of baseball right now," Texas manager Buck Showalter said. "We're hoping to have some fun in September. We still have half the month of August before we can make a run at this thing."
Seattle has lost 13 straight games against the AL West and is 10-25 in the division. The Mariners were last swept Sept. 15-18, 2005, against the Rangers. That was also Texas' last four-game sweep.
The Mariners fell a season-high nine games out of first place.
"We've got a lot of baseball still to play," Seattle manager Mike Hargrove said. "We're not done. We've got a long uphill battle ahead of us."
Millwood gave up three runs in six innings. He allowed eight hits and struck out four to win at home for the first time since June 16.
"It will go down as a quality start," Millwood said. "But for me, there's a lot of things I could have done better. I was not putting the ball where I wanted it."
Millwood was the beneficiary of some great defense from Matthews, who made a leaping catch near the wall in left-center in the fifth to rob Adrian Beltre of extra bases.
Matthews, who has made several highlight-reel catches in center this season, also had a three-run double in the second.
"It was pretty close to going out," Matthews said. "Maybe it would have been off the top of the wall. I thought I had a good shot at it and then I lost it for a minute. You just have to time your leap to get the ball at its highest point."
Kenji Johjima and Ben Broussard homered for the Mariners.
Hernandez (10-10) allowed seven runs in 5 2/3 innings. The right-hander yielded six hits, struck out eight and walked four in a career-high 117-pitch outing
After giving up three runs in the second, Hernandez retired the next six before Ian Kinsler led off the fifth with a single. Matthews then walked to set the stage for Young, who lined an 0-1 pitch to deep center for a triple.
Young came home on Lee's single, and the Rangers added a run in the sixth when Matt Stairs scored on a wild pitch.
In the seventh, Lee doubled, stole third and came home on an error to put Texas on top 8-3. He hit a two-run single in the eighth.
"I'm encouraged by the way we're playing," Matthews said. "We seem to be rolling on all cylinders."
Hernandez seemed to be cruising as he struck out four of the first seven hitters he faced.
Broussard's homer and Ichiro Suzuki's RBI single gave Seattle a 2-0 lead in the second. Broussard added a sacrifice fly in the third.
- Showalter said after the game that RHP Kip Wells will have his scheduled start Thursday pushed back until at least Saturday. Wells, who twisted his left foot Friday night, will see a foot specialist Monday to further determine his status. Edinson Volquez will start Thursday for Texas.
- Seattle's Ichiro Suzuki, who was 1-of-14 in the first three games of the series, had two hits.
- Texas' Mark Teixeira saw his 36-game streak of reaching base come to end. He was 0-for-5 with three strikeouts.
- Former heavyweight champion Evander Holyfield threw out the ceremonial first pitch.