Pirates and LHP Wade LeBlanc avoided arbitration by agreeing to a one-year, $750,000 contract with a $1.5 million option for 2018.
Pirates acquired LHP Wade LeBlanc from the Mariners for a player to be named later or cash considerations.
Mariners sent LHP Wade LeBlanc outright to Triple-A Tacoma.
Mariners designated LHP Wade LeBlanc for assignment.
Wade LeBlanc moved to 3-0 for the Mariners after allowing three runs in 5 1/3 innings Friday against the Brewers.
Wade LeBlanc earned his first victory of the season on Sunday, striking out seven over six innings of three-run ball against the Athletics.
Wade LeBlanc tossed a mediocre five innings in Tuesday's no-decision against the Tigers, surrendering four runs on 10 hits, including two homers.
Manager Scott Servais said the Mariners are leaning toward having Wade LeBlanc start Tuesday's game against the Tigers.
Wade LeBlanc turned in a quality start in Tuesday's no-decision against the Red Sox, surrendering three runs on five hits over six innings.
Wade LeBlanc has been shifted to the bullpen.
Wade LeBlanc surrendered five runs -- four earned -- in 3 1/3 innings against the Astros on Wednesday, allowing six hits and one walk while striking out only two.
Wade LeBlanc pitched six innings of two-run ball in defeating the Orioles on Friday.
Wade LeBlanc will remain in the Mariners starting rotation to start against the Orioles on Friday.
Wade LeBlanc shut out the Cardinals for six innings Friday in his return to the majors.