How did Red Sox OF prospect, Double-A Portland MVP Allan Castro fare in 2025?

Last month, Red Sox prospect Allan Castro was recognized as Double-A Portland’s 2025 Most Valuable Player. This article will examine how the 22-year-old outfielder fared with the Sea Dogs this season.

Castro broke camp with Portland in early April but suffered a left hamstring strain on Opening Day and was sidelined for the next month-plus as a result. He returned to action on May 7 and emerged as a stabilizing force in the Sea Dogs lineup during the season’s first half.

Leading up to the MLB All-Star break in mid-July, Castro batted .286/.373/.454 with eight doubles, one triple, seven home runs, 26 RBIs, 23 runs scored, eight stolen bases, 25 walks, and 44 strikeouts in his first 52 games (212 plate appearances) of the year. Upon returning from the break, however, the switch-hitter slashed an underwhelming .245/.330/.365 with 12 doubles, one triple, no home runs, 11 RBIs, 20 runs scored, seven stolen bases, 19 walks, and 35 strikeouts in his next 40 games (176 plate appearances) through September 7. He was placed on the injured list with an undisclosed injury four days later and ended the season there.

Altogether, Castro batted .268/.353/.400 with a team-leading 20 doubles, two triples, seven home runs, 37 RBIs, 43 runs scored, 15 stolen bases, 44 walks, and 79 strikeouts over 92 total games (388 plate appearances) for Portland in 2025. That includes a .217/.316/.265 line from the right side of the plate and a far more favorable .284/.365/.444 line from the left side.

Among 48 qualified hitters in the Eastern League this season, Castro ranked ninth in batting average, 10th in line-drive rate (26.5 percent), 11th in on-base percentage, 13th in OPS (.753), wOBA (.350), and wRC+ (119), 14th in slugging percentage and strikeout rate (20.4 percent), 15th in walk rate (11.3 percent), and 18th in swinging-strike rate (10.3 percent), per FanGraphs.

Defensively, Castro saw playing time at all three outfield spots for the Sea Dogs this year. The 6-foot-2, 206-pounder logged a team-leading 556 1/3 innings in center, 123 innings in right, and 12 innings in left, committing four errors and recording 10 assists in 188 total chances. He also made 13 starts at DH.

Hailing from the Dominican Republic, Castro originally signed with Boston for $100,000 as an international free agent in July 2019. An infielder at the time, the Santo Domingo native ultimately transitioned to the outfield and earned Red Sox 2021 Latin Program Position Player of the Year honors in his professional debut. He has gradually worked his way up the organizational ladder since then and has often been identified as a potential sleeper prospect.

Castro, who does not turn 23 until next May, is currently regarded by Baseball America as Boston’s No. 20 prospect. Similarly, MLB Pipeline has him ranked as the Red Sox’ No. 22 prospect, while SoxProspects.com has him at No. 26. He can become eligible for this winter’s Rule 5 Draft if not added to the club’s 40-man roster in November, but is otherwise projected to make the jump to Triple-A Worcester in 2026 if he remains in the organization.