The Mariners traded Wade Miley to the Baltimore Orioles in exchange for left-handed pitcher Ariel Miranda, who has spent much of the season at the Class AAA level.

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CHICAGO — A day after one of his best outings as a Mariner, Wade Miley packed his bags and headed to a new team. While he stood on the outfield grass and shagged batting practice balls before Sunday’s game, the Mariners were completing a trade with the Orioles that sent the left-hander back to the American League East.

“Obviously we just traded Wade Miley to the Orioles,” general manager Jerry Dipoto said in a statement. “It is a bittersweet ending to the trade we made last winter with high hopes. We are appreciative of everything that Wade did for the Mariners organization, culminating with his best performance of the season yesterday against the Chicago Cubs, one of the best teams in the league. We are glad that Wade can go from one team in playoff contention to another, and to a division that he has had success in during his career.  This decision is the best move for the Mariners present and future.”

In exchange, the Mariners received left-handed pitcher Ariel Miranda from the Orioles.  Miranda, 27, has spent most of the season at Class AAA Norfolk, making 19 starts and posting a 4-7 record with a 3.93 ERA in 19 starts. In 100 2/3 innings pitched, Miranda has struck out 87 and walked 31. In his last seven starts, he’s 3-0 with a 1.93 ERA with 33 strikeouts and 11 walks in 42 innings pitched. He made his big league debut against the Mariners on July 3 at Safeco Field, pitching two innings and giving up three runs on four hits, including a RBI double to Robinson Cano and a two-run double to Kyle Seager. He will report to Class AAA Tacoma.

“Ariel Miranda is a power left-handed pitcher with a four-pitch mix that is Major League ready that provides us with flexibility,” Dipoto said. “We are very excited for what he can bring to the Mariners.”

Miranda has a fastball that sits around 93-95 mph, a slider and a splitfinger fastball. He’s a Cuban defector that signed with the Orioles for $800,000 in 2015.

Miley was a major acquisition for Dipoto this offseason. When it was confirmed that Hisashi Iwakuma had agreed to a free agent deal with the Los Angeles Dodgers just before the winter meetings, Dipoto immediately traded reliever Carson Smith and starting pitcher Roenis Elias to Boston for Miley and reliever Jonathan Aro.

The Mariners liked that Miley was under club control through 2017 and felt that the free agent starting pitching market was overpriced. They valued his durability and felt that he would be better off in the pitcher-friendly parks of the American League West.

Miley didn’t quite pitch to those expectations, posting a 7-8 record with a 4.98 ERA. He dealt with shoulder issues in May with a stint on the 15-day disabled list. He struggled with mechanical issues. But four of his last five starts were quality starts, including Saturday’s outing where he took a no-hitter into the seventh inning and allowed one run.