Dipoto: Seattle bullpen an ‘ongoing evolution’

SEATTLE — How much change has the Mariners’ bullpen undergone in four months? With a third of the season remaining, lefty Vidal Nuno is the only reliever who was on Seattle’s Opening Day roster to still be active for Saturday’s game with the Angels.

Closer Steve Cishek is on the 15-day disabled list after losing his role to rookie Edwin Diaz. Right-handers Nick Vincent and Tony Zych are also on the DL, veteran right-hander Joaquin Benoit and lefty Mike Montgomery were traded and Joel Peralta released.

In their stead, the Mariners have cycled through 19 relievers already and general manager Jerry Dipoto added two more names to the mix on Saturday by acquiring hard-throwing right-hander Arquimedes Caminero and switch-pitcher Pat Venditte via trades.

“It’s an ongoing evolution in the bullpen,” Dipoto said. “We’ve had a lot of attrition. We’ve had extended streaks of solid performances from some guys, but we’ve somehow got to get back to where we were early in the year. We keep adding and creating more depth. With all the injuries, it’s been incredible. We’re coming up on 30 pitchers [including starters] we’ve used and that’s an unfortunate year.”

Vincent threw an inning for Class A Everett on Friday with one hit and three strikeouts. He says he’s ready to return, but the Mariners might have him throw once more for Triple-A Tacoma as …

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