The Mariners will hope to put an end to Jarrod Parker's historic streak on Monday in Oakland. In his past 14 starts, the 22-year-old righty is 6-0 with a 2.75 ERA and has held opponents to a .199 batting average. The winning streak is a career high and the 14-start unbeaten streak matches the second-longest by an A's pitcher over the last 39 years.
That dominance has come in spite of little help from his teammates. He's received two runs of support or fewer in 11 of the 16 games in which he took the loss or had a no-decision.
He allowed one run over 8 1/3 innings for Oakland in his last start, a 2-1 extra-innings loss to the Astros on Wednesday.
"You pitch like that and you get that deep into the game and only give up one run," Oakland manager Bob Melvin said. "You're going to win that game a lot more times than not."
While Parker tries to keep the mojo going for the A's -- who trail the Rangers by just a half-game in the American League West -- the Mariners' Aaron Harang will simply be content to go out and throw a quality start. The 35-year-old is 1-3 with an 8.07 ERA over his past six starts. He took a no-decision in his last start Wednesday when he gave up seven hits and three runs in five innings against the Rays in St. Petersburg.
Harang was in position to win that game as the Mariners led, 4-3, going into the ninth, but the Rays rallied with two runs against closer Danny Farquhar in his first blown save since taking over for Tom Wilhelmsen.
Harang gave up just one run in the first five innings in that game, then got into trouble in the sixth when he surrendered four straight hits, including a two-run homer by Wil Myers. Harang said his right forearm tightened in that final inning.
"I felt good early on," Harang said. "But I was having a tough time getting good extension at the end and I left a fastball up and in to Evan Longoria. He has really quick hands in. And obviously the same with Myers."
Acting manager Robby Thompson said Harang should be fine for Monday's start, however.
"He had a little tightness in the forearm and he's been getting treatment on it," Thompson said. "They hit it pretty hard in the training room the next day and I think he should be fine."
Mariners: Morse and Ibanez out of lineup
Outfielders Michael Morse and Raul Ibanez got the day off Sunday as Thompson went with Dustin Ackley in left and Endy Chavez in right. Thompson said Ibanez would be back in the lineup Monday against Parker. Morse's situation is less certain as he's been struggling since coming off the disabled list and the A's are throwing three straight righties in the series.
Morse has hit just .161 in 14 games since coming off the DL with a strained hamstring and Thompson said opposing pitchers will continue pitching him inside until he shows he can hit that pitch.
"Right now, they're just pounding away at a weakness. Everyone has advance scouts and they're saying, hey, until he proves us differently we're going to continue pounding away at it," Thompson said. "It's up to Michael to be able to make that adjustment and either lay off those pitches that are inside or get the ball out over the plate.
"But each time he steps up to the plate, you're thinking big things can happen. It just hasn't happened of late. So he'll get the day off today and we'll see where he's at tomorrow."
Athletics: Donaldson gets some much-deserved rest
Josh Donaldson has been a revelation at third base for Oakland this season, batting .297 with an .859 OPS entering Sunday's game against the Indians. Still, Donaldson started at DH in that game for the second time in the past week, having started 119 of the previous 122 games at third base.
Alberto Callaspo made the start at the hot corner Sunday afternoon. In the A's 7-3 win, Donaldson went 2-for-5 with three RBIs, while Callaspo -- who committred his 14th error -- went 3-for-4 with a homer and scored two runs.
"He's a guy that's been out there defensively every single day all year for the most part," Melvin said of Donaldson. "Now that we have Alberto here, who's a very good third baseman in his own right, we're able to do that some."
• The Mariners are on pace to have their first winning record in the American League West since going 31-26 in 2009. Seattle is 29-25 against its division rivals and have winning records against every team except Texas.
• The Mariners lead the Major Leagues in home runs hit in the eighth inning or later with 35.
• Oakland began the season 13-3 against the AL West, but are just 18-20 against the division since May 20.
Jacob Thorpe is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.