Red Sox outfield prospect takes another step forward in 2023

Another year, another step forward for Red Sox outfield prospect Allan Castro.

Castro, who assistant general manager Eddie Romero identified as a sleeper prospect at the conclusion of the 2022 season, broke camp this spring with Low-A Salem and served as the Red Sox’ Opening Day right fielder.

In 69 games with Boston’s Carolina League affiliate, Castro batted .247/.376/.378 with 20 doubles, two triples, three home runs, 29 RBIs, 39 runs scored, 15 stolen bases, 51 walks, and 54 strikeouts over 306 plate appearances. The 20-year-old then received a promotion to High-A Greenville in mid-July and debuted for the Drive immediately following the All-Star break.

With the eventual South Atlantic League champions, the switch-hitting Castro slashed a stout .283/.355/.446 to go along with 11 doubles, two more triples, four homers, 17 runs driven in, 23 runs scored, four stolen bases, 17 walks, and 26 strikeouts in 43 games (186 plate appearances). He also went 4-for-13 (.308) with a home run in four postseason games as Greenville went on to clinch its first Sally League title since 2017 last month.

Among 137 hitters who made at least 180 trips to the plate during the regular season, Castro ranked 21st in strikeout rate (19.4 percent), 17th in batting average, 39th in slugging percentage, 31st in slugging percentage, 27th in OPS (.801), 16th in line-drive rate (24.6 percent), and 29th in wRC+ (119), per FanGraphs.

Between Salem and Greenville, Castro saw playing time at all three outfield positions. With the Drive specifically, the 6-foot, 170-pounder logged 49 innings in left, 138 innings in center, and 127 innings in right. He committed a total of three errors while recording one outfield assist.

A native of the Dominican Republic, Castro originally signed with the Red Sox for $100,000 as an international free agent in July 2019. At that time, Castro was viewed as a middle infielder, but he had already transitioned to the outfield by the time he made his professional debut in the Dominican Summer League two years after signing as a result of the COVID-19 pandemic.

Castro made strides right away in the DSL and was recognized as Boston’s 2021 Latin Program Position Player of the Year. He then made the jump to the rookie-level Florida Complex League in 2022 and impressed there before closing out the season in Salem.

Coming into the 2023 campaign, Castro was unranked by publications such as Baseball America and MLB Pipeline. He is now regarded by the former as the No. 27 and by the latter as the No. 30 prospect in Boston’s farm system. SoxProspects.com, on the other hand, now has Castro ranked 17th on its list after having him at No. 33 to begin the year.

Castro, who does not turn 21 until next May, can become eligible for the Rule 5 Draft this winter if he is not added to the Red Sox’ 40-man roster by the protection deadline in November. Given his lack of experience in the upper-minors, though, the likely outcome is that he is left unprotected, is not picked up by another team, and remains in the organization as an intriguing prospect with room to grow.

Barring a trade or any sort of other move, Castro is projected by SoxProspects.com to return to Greenville for the start of the 2024 minor-league season in April.