Red Sox to promote pitching prospect Zach Penrod to Triple-A Worcester

The Red Sox are promoting pitching prospect Zach Penrod from Double-A Portland to Triple-A Worcester, as was first reported by Josh Ball of Beyond the Monster.

Penrod has not officially been added to Worcester’s roster yet but was at Polar Park for Saturday’s 9-5 loss to the Norfolk Tides. The 26-year-old left-hander last pitched for Portland on Friday, allowing four earned runs on five hits, one walk, two hit batsmen and nine strikeouts over 5 1/3 innings in Game 1 of a doubleheader against the Hartford Yard Goats at Hadlock Field. He threw 90 pitches (59 strikes) and elicited 17 swings-and-misses.

The reigning Eastern League Pitcher of the Week, Penrod posted a 2.80 ERA and 2.81 FIP with 53 strikeouts to 13 walks in seven starts (35 1/3 innings) for the Sea Dogs this season. He has struck out 29 of the last 69 batters he has faced dating back to May 12.

Among 38 qualified Eastern League pitchers coming into play on Saturday, Penrod ranked first in strikeouts per nine innings (13.5), swinging-strike rate (17.2 percent), and xFIP (2.72), second in strikeout rate (37.1 percent), fourth in batting average against (.183) and FIP, sixth in WHIP (1.02), and 13th in ERA, per FanGraphs.

Penrod, who turns 27 next month, is in his first full season with the Red Sox organization after signing with the club out of the independent Pioneer League last August. The Idaho native had past experience in affiliated ball after originally going pro with the Rangers as an undrafted free agent out of Division II Northwest Nazarene University in 2018. He pitched in the rookie-level Arizona Complex League that summer but underwent Tommy John surgery the following April and was ultimately released by Texas at the height of the COVID-19 pandemic in June 2020.

After spending the better part of three seasons (2021-2023) bouncing around the Pioneer League, Penrod latched on with the Red Sox last summer and reported to High-A Greenville. He pitched to a 2.18 ERA in four starts (20 2/3 innings) down the stretch and helped the Drive win a South Atlantic League title before heading out west and earning All-Star honors in the Arizona Fall League.

Altogether, Penrod has compiled a 2.57 ERA (3.26 FIP) with 73 strikeouts to 24 walks in 11 starts (56 innings) between Greenville and Portland. He is currently regarded by SoxProspects.com as the No. 29 prospect in Boston’s farm system, which ranks 12th among pitchers in the organization.

Listed at 6-foot-2 and 210 pounds, Penrod throws from a three-quarters arm slot. As noted by The Boston Globe’s Alex Speier and SoxProspects.com’s Ian Cundall, the southpaw operates with a 94-95 mph fastball that has topped out at 97 mph, an 85-88 mph changeup, and an 84-87 mph slider.

With this promotion to Worcester, Penrod is now just one call away from the major-leagues. In the interim, he will join a WooSox starting rotation that –at the moment — includes the likes of righties Richard Fitts, Grant Gambrell, Jason Alexander, Josh Winckowski, and Naoyuki Uwasawa.