North Star Nine Prospect Weekly: Bohorquez Keeps Dealing at Double-A, Rosario's September Power Surge

By ·

North Star Nine Prospect Weekly covers the last 7 days of action for the Twins farm system.

Bohorquez Is Pitching Like a Different Guy at Double-A

Adrian Bohorquez (AA, RHP, Rank: 23) threw five innings against 17 batters this week, allowing just one hit and no runs while walking one and striking out four. He generated 10 swinging misses on 76 pitches, which is a 13.2 percent whiff rate on a night that did not require the pure swing-and-miss stuff to be at its loudest, just effective sequencing and enough command to stay ahead. That last part is the story of his entire September stretch. Over his last 30 days at Double-A, Bohorquez owns a 1.25 ERA across five starts covering 21.2 innings: 25 strikeouts, 9 walks, 10 hits allowed, and a 0.88 WHIP. His whiff rate for the season sits at 31.2 percent, and the strikeout rate across all levels this year checks in at 27.3 percent.

The profile asks a lot of questions that are not yet fully answered. He carries a 55 fastball that sits 95-98, a slider and a curve that each grade at 50, and a changeup that is still a below-average 40. Command is at 45, and the Double-A walk numbers for the season, 7 in 17 innings at that level, reflect real progress from the 24 walks he issued in 38.2 innings at High-A. That improvement is the reason the last 30 days look so different from the first half of his 2026. For the full year across all levels, his combined ERA is 3.02. The projection is a back-end starter or multi-inning arm depending on whether the changeup becomes a weapon and the walk rate settles near average. What September has shown is that both outcomes carry real value, and he is pitching his way toward the better one right now. I'd argue the command gains are stickier than a one-month sample usually suggests, partly because the underlying stuff has not changed; it's the delivery sync that has, and those adjustments tend to hold.

Rosario's Triple-A Power Binge Keeps Coming

Kala'i Rosario (AAA, OF, Rank: 38) hit three home runs across 25 plate appearances this week, driving in five runs against two walks and seven strikeouts. That box score is a perfect snapshot of his entire season at Triple-A: the power is absolutely real, the contact is still spotty, and the walks have largely dried up since the promotion. Over his last 30 days at St. Paul, he is slashing .305/.313/.695 with nine home runs in 83 plate appearances. The slugging number belongs in a different sport; the on-base percentage tells you that nearly every base he is reaching is via the home run ball. His Triple-A strikeout rate for the season sits at 30.8 percent, and his walk rate in that same span is 7.1 percent, consistent with the profile he ran at Double-A, where the walks were much more present (16.7 percent at Wichita) but the contact was similarly limited.

Rosario is a 40 hit, 55 power corner outfielder with a 35 field grade, and the projection is an up-down role rather than an everyday spot. The September power is not rewriting that read. His combined 2026 line across Double-A and Triple-A stands at .256/.364/.481 with 22 home runs in 407 plate appearances, and his contact rate this month at Triple-A is 75.2 percent, meaningfully better than his season contact rate of 68 percent, which is part of why the power has translated so cleanly. The hit-tool limitation remains the ceiling constraint. A corner-only profile with persistent swing-and-miss needs the power to show up at an above-average clip consistently, not just in hot stretches. September has been a hot stretch. Whether it signals a genuine zone-coverage adjustment or a favorable matchup run is a question October rosters will not resolve. He is 24, the raw is legitimate, and the power has played at every stop; the rest of the offensive case still has to catch up.

Quick Hits

Read the full story on 80Grade