Giants trade Trevor Rosenthal to Brewers just 12 days after signing him

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Where were you when the Trevor Rosenthal Era ended in San Francisco?

The rehabbing reliever was shipped to the Milwaukee Brewers Tuesday shortly before the MLB Trade Deadline in exchange for minor league outfielder Tristan Peters. Rosenthal was traded just 11 days after his free-agent signing, without ever throwing a pitch for the organization. He reportedly was rehabbing in Arizona in hopes of contributing in the coming weeks.

Rosenthal’s departure was one part of an unusual trade deadline day executed by Farhan Zaidi and the Giants’ front office.

San Francisco signed Rosenthal on July 22 to an incentive-laden deal that was a low-risk, high-reward option for the team. Rosenthal hasn’t pitched since 2020, as his 2021 season with the A’s was wiped out due to two surgeries, one for Thoracic Outlet Syndrome and another for a torn labrum in his right hip.

The Brewers recently parted ways with All-Star closer Josh Hader, who landed with the aggressive San Diego Padres. When he last pitched in 2020, Rosenthal was an effective closer with 11 saves and a 1.90 ERA in 23 appearances while ranking in the top 99th percentile for fastball velocity, strikeout rate, expected ERA and expected batting average.

Peters, 22, was a seventh-round pick by the Brewers in 2021 and is slashing .306/.386/.485 with seven homers and 51 RBIs for the High-A Wisconsin Timber Rattlers this season. Like many of the seven prospects acquired over the past two days – Peters is still a couple years away from contributing to the big-league club, if at all. Outfielder J.D. Davis, acquired in the Darin Ruf deal with the New York Mets, has played in the big leagues since 2017, but the other seven players the Giants acquired at the deadline are minor league prospects.

Rosenthal, catcher Curt Casali and Matthew Boyd were all dealt despite being on the injured list. Like Rosenthal, the southpaw Boyd never actually took the mound in a Giants uniform at any level, as he continues to rehab from September 2021 surgery to repair a torn flexor tendon in his left arm.

Holding onto players like Rosenthal, Casali, Boyd and Ruf would have seemed to help the Giants down the stretch, but San Francisco decided to sell their small trade chips while keeping blue chips Carlos Rodón and Joc Pederson.

San Francisco could use some help down the bullpen if they want to contend, so Rosenthal’s departure is a bit of a head-scratcher. Peters could end up being a nice player, but the Giants are stuck in the middle after the moves they made Tuesday.