Fenway Farm Prospect Weekly: Ziehl dominates his Triple-A debut, Romero's best week of the year
By James Collins ·
Command the Zone, Collect the Ks: Gage Ziehl's Triple-A Debut
Gage Ziehl (AAA, RHP, Rank: 11) had been building toward this for a while, and his first Triple-A outing delivered. Promoted from Portland to Worcester on August 4, Ziehl went 5.1 innings in his debut, allowing just 2 hits, walking nobody, and striking out 8. That kind of first impression does not happen by accident. The last 30 days at Double-A told the story of a pitcher who was no longer being challenged: 19.2 innings, 28 strikeouts, 3 walks, and a 1.37 ERA. The promotion was overdue, and the Worcester debut confirmed it.
What makes Ziehl tick is not raw stuff but execution. His four-seamer sits 93-95 mph and is firmly average, yet he throws it to all four quadrants with a 60-grade command profile, distinguishing him from pitchers with better arms but worse feel. The sweeper-cutter pairing is the real bat-missing engine: the sweeper works as a chase pitch and the cutter gives him another hard, short look he can locate. His 81-inning Double-A season showed a 4.33 ERA that is a little soft given the peripherals, and the 96 strikeouts against 18 walks in that sample is a more accurate reflection of the profile. The ceiling is a back-end starter or swingman rather than a mid-rotation fixture, but if the changeup develops into a more dependable answer against left-handed hitters, the role can firm up. For now, eight strikeouts and a 0.35 WHIP in his Triple-A introduction is the opening statement he needed.
Still Here, Still Swinging: Mikey Romero's Week to Remember
Mikey Romero (AAA, SS, Rank: 7) has had a subdued 2026 by his own standards, slashing .239/.303/.391 across 87 games at Worcester. Then last week happened. In 24 plate appearances he went 10-for-22 with a double, a triple, 2 home runs, and 5 RBI, striking out just four times. That is the version of Romero that made him a first-round pick: a smooth left-handed stroke that makes hard contact to all fields and generates enough loft to produce real power. His last 30-day numbers still show a .250 average with 3 home runs, which is solid rather than spectacular, but last week suggested the bat may be heating up at the right time.
The scouting picture on Romero has always centered on feel for hitting rather than tools. He has a 55 hit tool, average power, and enough defensive competence at second or third base to project as a second-division regular if everything clicks. The concern this season has been walk rate: only 30 walks in 381 plate appearances does not reflect the zone management that made him appealing coming out of the draft, and the profile needs more on-base production to carry a corner or second-base role at the next level. His 2025 line in a combined Double-A and Triple-A season showed a similar walk suppression issue, so this is not new. But when Romero's swing is right, the contact quality and doubles power are real, and last week was a reminder of what the ceiling looks like when the approach and the bat sync up. He is 22 with two full Triple-A seasons ahead of him, and there is still time to grow into the walk rates the profile demands.
Quick Hits
- Franklin Primera (A, C, Rank: 3) · went 4-for-19 with a double, 4 walks, and 3 hit by pitches in 19 plate appearances last week. A 19-year-old catcher getting on base at a .528 clip over his last 30 days at Low-A is genuinely unusual. The combined season line of .370/.502/.594 across 57 games is built on a 55 hit tool and a patient approach that has produced 36 walks against only 29 strikeouts in 246 plate appearances. He may be the most interesting offensive catching prospect in the organization right now.
- Allan Castro (AAA, CF, Rank: 29) · piled up 10 hits in 23 plate appearances with 3 doubles, 3 walks, and zero strikeouts. The contact was everywhere, and the no-strikeout week from a player who had been inconsistent against upper-level pitching all year is worth flagging. He is hitting .333 over his last 30 days at Triple-A with a .395 on-base percentage, the best stretch of his 2026 season. He profiles as an up-down outfielder rather than an everyday piece, but stretches like this keep the conversation alive.
- Louis Andujar (A, SS, Rank: 19) · went 8-for-18 with 2 doubles, a homer, and 4 RBI in 18 plate appearances at Low-A Salem. The 18-year-old is slashing .333/.414/.667 over his last 30 days at the level, with 4 home runs and 6 doubles in that stretch. For context, his combined season line sits at .279/.366/.489 with 9 home runs and 14 stolen bases across two levels. The fringe power projection may need a revisit if this keeps up.
- Angel Bastardo (AAA, RHP, Rank: 30) · threw 4 innings of one-run ball with 5 strikeouts and zero walks. Over his last 30 days at Worcester, that looks even better in context: 12 innings, 21 strikeouts, 0 walks, and a 0.75 ERA across 8 appearances. Bastardo has been one of the more pleasant surprises in the bullpen, and the fastball-changeup combination is posting whiff rates that support the 55-grade changeup. The season ERA of 4.12 through 43.2 innings is being rapidly dragged down by that recent stretch.
- John Holobetz (AAA, RHP, Rank: 18) · worked 4 innings, allowing 5 hits but no runs and no walks while striking out 2. Underneath the pedestrian line, Holobetz has been outstanding since joining Worcester: a 0.54 ERA over his last 16.2 Triple-A innings with 21 strikeouts and just 1 walk. The combined ERA across both levels sits at 3.96 through 88.2 innings, and the 60-grade fastball with its outlier vertical break is giving hitters problems even if the strikeout rate in last week's outing was modest.
- Ronny Hernandez (A+, C, Rank: 34) · drove in 5 on 6 hits, drawing 3 walks against 3 strikeouts in 17 plate appearances. He is hitting .356 over his last 30 days at Greenville with a .441 on-base percentage, and the season line of .306/.423/.553 with 11 home runs is well ahead of what the scouting grades suggest. I would take the over on a bench projection for a 21-year-old catcher with those numbers at High-A.
- Mason White (AA, SS, Rank: 43) · went 6-for-22 with 2 homers and 5 RBI in his 22 plate appearances at Portland, adding 3 walks. The left-handed bat is at .265/.358/.510 combined across High-A and Double-A with 17 home runs, and his last 30 days at the Double-A level show a .271 average and 4 home runs. The power is already playing at the high end of the 50-grade projection.
- Johanfran Garcia (AA, C, Rank: 22) · went 4-for-13 with a double and a homer, driving in 2 in 13 plate appearances. The season line of .296/.338/.498 with 13 home runs through 260 plate appearances at Double-A backs up the plus raw power that anchors his profile. Eleven more strikeouts in 13 plate appearances last week is a reminder that the 45 hit tool is the cap on how far the power can take him.
- Sadbiel Delzine (A, RHP, Rank: 14) · struck out 5 over 3.2 innings of scoreless work in his start, allowing just 2 hits and 1 walk. The 18-year-old has a 1.50 ERA through 12 innings at Low-A with 16 strikeouts, and the combined ERA across both levels sits at 2.44 over 51.2 innings. The 55-grade fastball and promising changeup are both translating to results, and the promotion from the complex to full-season ball this summer is already looking like an easy call.
- Garielvin Silverio (RK, OF, Rank: 49) · had the most eye-catching raw line of the week in the complex: 6 hits in 19 plate appearances with 3 home runs and 9 RBI. Silverio is 17 years old with a 55 raw power grade and the season numbers back it up, with 5 home runs and a .411 slugging percentage in 185 plate appearances at the DSL level. The strikeout rate is the thing to watch; he punched out 8 times last week, and the K rate of 42 in 185 PA will need to come down as he climbs.
- Henry Godbout (A+, SS, Rank: 10) · reached base in all 14 plate appearances via some combination of 2 hits, 4 walks, and 3 hit by pitches, driving in 1. The production is almost entirely driven by on-base ability rather than impact, which matches the profile for a 55 hit tool, 40 power combination. He is slugging .286 over his last 30 days but posting a .565 on-base percentage. The bat-to-ball is real; the question is whether there is ever enough thump to carry a second-base projection at higher levels.