SAN FRANCISCO — Reliever Tony Sipp pitched in 36 games for the Washington Nationals this season, compiled a 4.71 ERA and at times looked like the left-handed specialist they signed him to be in March. But the 36-year-old’s short run with the organization came to a quiet end.

Sipp was designated for assignment by the Nationals last week as the team made room for three new relievers acquired at the trade deadline. He was then placed on outright waivers for three days, was not claimed by a team and was offered a minor league assignment by Washington. He rejected that offer, according to a person with knowledge of the situation, and will go on release waivers. If he clears those, too, Sipp will be a free agent this week.

The Nationals designated Sipp, Javy Guerra and Michael Blazek for assignment to clear space on their 25- and 40-man rosters. (Justin Miller was also designated for assignment July 29.) But Sipp was the only one of the four to opt for free agency instead of staying in the system. He signed a one-year deal worth a guaranteed $1.25 million in mid-March. He struggled at the start of the season, as most of the Nationals’ relievers did, and went on the injured list with a strained oblique in early May.

His best stretch came in late June and July, when he went eight appearances and 4⅔ innings without allowing a run. But back-to-back shaky outings ahead of the trade deadline sealed his fate. Washington traded for lefty Roenis Elías and didn’t need four lefties — along with Sean Doolittle and Matt Grace — in an eight-man bullpen. Guerra is already back on the Nationals’ roster, having accepted an assignment with Class AAA Fresno, then getting added back to the 25-man roster Sunday when Elías went on the IL with a right hamstring strain.

That showed the benefit of staying with the Nationals instead of testing the late-season free agent market. But with no more August trades and contenders always needing bullpen help, Sipp could still find a home elsewhere.

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