Zach Pop

Zach Pop cleared outright waivers and elected free agency, the Mariners announced. Seattle had designated the righty reliever for assignment over the weekend.

Pop, 28, had a brief run in Dan Wilson’s bullpen. He signed a minor league contract in mid-April and was selected onto the MLB roster on June 13. The Kentucky product made four appearances over the next two weeks. He gave up nine runs (eight earned) on 10 hits and a pair of walks through 5 1/3 innings. Pop recorded only three strikeouts among 30 batters faced with a well below-average 7% swinging strike percentage.

Before his brief run in Seattle, Pop spent a couple seasons as a middle reliever with the Blue Jays. He hasn’t missed many bats but recorded a gaudy 55% ground-ball rate across 48 1/3 innings last year. While hitters had a difficult time elevating the ball, they did a lot of damage when they were able to get it in the air. More than 20% of fly balls cleared the fences, leading to a 5.59 earned run average.

Pop owns a 4.75 ERA in parts of five big league campaigns. He’ll probably be limited to minor league offers but should intrigue teams as a depth option thanks to a sinker that averages around 96 MPH.

The Mariners announced they’ve selected righty reliever Zach Pop onto the big league roster. Rookie starter Logan Evans was optioned back to Triple-A Tacoma to create an active roster spot. Seattle had two openings on the 40-man roster.

Pop will make his team debut whenever he gets into a game. He joined Seattle in mid-April on a minor league deal. That came after he was released by the Blue Jays. Pop was battling elbow inflammation at the time, but he got back on the mound by the middle of May. He made two rehab appearances in the complex league before reporting to Tacoma. Pop has made 11 appearances and tossed 9 2/3 innings, allowing seven runs (though only three were earned). He has fanned nine against five walks.

The 28-year-old Pop has pitched in parts of four MLB seasons. He threw 48 1/3 frames for the Jays last season, working to a 5.59 ERA with a well below-average 15.8% strikeout percentage. Pop doesn’t have huge swing-and-miss stuff, but he sits around 96 MPH with his sinker and has posted a gaudy 55% ground-ball rate in his career. He’ll add a grounder specialist to Dan Wilson’s middle relief corps for the time being. He’s out of minor league options, though, so the M’s would need to designate him for assignment to take him off the big league roster.

Seattle can operate with an extra reliever for this weekend’s series against the Guardians. Luis Castillo, George Kirby and Emerson Hancock are lined up to start those games. Adam Jude of The Seattle Times writes that Logan Gilbert is expected to return from the injured list during next week’s series against the Red Sox, at which point Seattle will go back to five starters and an eight-man bullpen. Gilbert has been down since late April with a flexor strain. He has made a trio of rehab starts with Tacoma, combining for 9 2/3 innings of three-run ball.

The Mariners and right-hander Zach Pop have agreed to a minor league contract, per the transaction log at MiLB.com. The Blue Jays designated Pop for assignment at the end of spring training when they needed a 40-man roster spot. The out-of-options righty was battling elbow inflammation at the time, and since injured players can’t be placed on outright waivers, the Jays instead had to place him on release waivers. He became a free agent a couple weeks ago and will now join the fifth organization of his professional career.

Pop, 28, was a seventh-round pick by the Dodgers back in 2017. Los Angeles traded him and four others to the Orioles in the 2018 Manny Machado blockbuster, and he’s since pitched with the Marlins and Blue Jays organizations. The 6’4″ righty has logged big league time in each of the past four seasons, working to a combined 4.45 ERA with a sub-par 18.4% strikeout rate, a solid 7.9% walk rate and an excellent 55% ground-ball rate.

The 2024 season was a struggle for Pop, who pitched to a grisly 5.59 ERA over the course of 48 1/3 innings. With his sinker being hit harder than usual in 2023-24, Pop began to incorporate a cutter a couple months into the season. The pitch showed some promise, generating plenty of pop-ups and whiffs when chased off the plate, but Pop also misfired with it too often and served up three of his nine homers on the new offering — despite only throwing it at a 12.3% clip.

If the Mariners can help Pop refine that cutter or perhaps implement a new third offering, he could yet emerge as a reliable bullpen arm. He sits 96 mph with his sinker, which is plenty in terms of velocity, and his slider has long graded as a quality offering. The pitch misses bats, and opponents have slugged only .328 against it when making contact. Add in his lofty ground-ball numbers and it’s easy enough to see why the Mariners feel they may be able to coax another level out of him, even if the results over the past couple seasons have been rough.