Mariners rookie Adrian Sampson will make his big league debut Saturday afternoon opposite the Red Sox's Rick Porcello at Fenway Park.
Left-hander Wade Miley was scheduled to start for Seattle against his former team, but he was placed on the 15-day disabled list, retroactive to Monday, with aleft shoulder impingement. Sampson joined the team in Boston on Friday from Triple-A Tacoma and was activated for Saturday's start.
Sampson, 24, is 7-4 with a 3.25 ERA in 13 starts for Tacoma. He was acquired from the Pirates last July 31 in a trade for veteran J.A. Happ.
Porcello (7-2, 3.81 ERA) gave up four runs (one earned) over seven innings in a loss to the Twins on Sunday. Porcello is 5-0 with a 3.03 ERA in five starts at Fenway this season.
Three things to know about this game
• With Porcello going as the lone right-hander in the series, the Mariners will likely go with a lefty-heavy lineup on Saturday.
"That's a revamped team," Red Sox manager John Farrell said of Seattle. "Their offense is much different than it has been the past couple of years, not just because of where they play. They have power up and down the lineup. They have the ability to match up well, too. They've added speed and power."
• Porcello is the 10th Red Sox pitcher since 1913 to win his first five starts at home in a season, the last being Tim Wakefield with six starts in 2009.
• Catcher Christian Vazquez hasn't started behind the plate for Boston the last two games as he's taking extra batting practice to improve his offensive numbers. Vasquez is hitless in his last 11 at-bats and 4-for-29 this month, batting .209 on the season.