Red Sox promote power-hitting IF prospect Mason White to Double-A Portland

The Red Sox have promoted power-hitting infield prospect Mason White from High-A Greenville to Double-A Portland, as was first reported by Andrew Parker of SoxProspects.com.

White is currently ranked by both Baseball America and SoxProspects.com as Boston’s No. 27 prospect. The 22-year-old has reached the upper minors in his first full professional season after being selected by the Red Sox in the fourth round (118th overall) of last summer’s draft out of the University of Arizona. He received a $642,200 signing bonus and made his pro debut with Low-A Salem before moving up to Greenville, where he opened the 2026 campaign.

In 68 games for Greenville out of the gate this year, White batted .270/.362/.525 with 14 doubles, three triples, 14 home runs, 42 RBIs, 36 runs scored, 31 walks, and 63 strikeouts over 282 plate appearances. The left-handed hitting slugger slashed .317/.417/.537 in 48 plate appearances against lefties and .261/.350/.522 in 234 plate appearances against righties.

Among 71 qualified South Atlantic League hitters entering play Saturday, White ranks ninth in isolated power (.254), 10th in slugging percentage and OPS (.887), 11th in batting average, 14th in wOBA (.386), 15th in wRC+ (121), 18th in swinging-strike rate (10%), 24th in on-base percentage, and 27th in strikeout rate (22.3%), according to FanGraphs.

Defensively, White primarily split his playing time with Greenville between second base and shortstop. In 35 starts at second, the 5-foot-11, 178-pounder committed two errors in 136 chances across 308 1/3 innings. In 27 starts at short, he committed one error in 87 chances across 237 1/3 innings. He also made five starts at DH.

White, who turns 23 in September, is the third member of Boston’s 2025 draft class to make the jump to Portland this season, joining third-rounder Anthony Eyanson and 13th-rounder Jack Winnay. Though there will be questions about how he adjusts to tougher, higher-quality pitching at Double-A, his promotion nonetheless helps the Sea Dogs address the void left by fellow infielder Marvin Alcantara, who was placed on the 7-day injured list on Friday.

(Picture of Mason White: Gwinn Davis/Greenville Drive)

How Red Sox IF prospect Mason White is faring with High-A Greenville

Led by Franklin Arias, the Red Sox have a talented group of infield prospects in their farm system. Lost in the shuffle, perhaps, is the club’s fourth-round pick in last year’s draft: Mason White.

Selected 118th overall last July following a decorated career at the University of Arizona, White signed with the Red Sox for an at-slot $642,200. The Tucson native then debuted with Low-A Salem before working his way up to High-A Greenville, where he returned for the start of his first full professional season out of camp this spring.

Nearly four months into the 2026 campaign, White has proven to be a stabilizing force in Greenville’s lineup. The left-handed hitting 22-year-old is batting .269/.356/.512 with 14 doubles, three triples, 13 home runs, 40 RBIs, 33 runs scored, 29 walks, and 63 strikeouts in 67 games (278 plate appearances) for the Drive. He is slashing .317/.391/.537 in 46 plate appearances against lefties and .259/.349/.507 in 232 plate appearances against righties.

Among 53 South Atlantic League hitters who have made at least 275 trips to the plate this season, White ranks seventh in isolated power (.244), slugging percentage, eighth in batting average and OPS (.868), 10th in wOBA (.380), 12th in swinging-strike rate (10.1%) and wRC+ (116), 20th in on-base percentage, and 21st in strikeout rate (22.7%), according to FanGraphs.

Defensively, White has primarily split his playing time with Greenville this year between second base and shortstop. In 31 starts at second, the 5-foot-11, 180-pounder has committed two errors in 136 chances across 308 1/3 innings. In 26 starts at short, he has committed just one error in 85 chances across 228 1/3 innings. He has also made five starts at DH.

White, who turns 23 in September, is currently ranked as Boston’s No. 27 prospect by both Baseball America and SoxProspects.com. Baseball America tabbed him as the best power hitter in the Red Sox’ 2025 draft class, citing how he “swings with intent in any count or situation with firing hand speed and great torque.” SoxProspects.com, meanwhile, notes that he “hits the ball hard consistently, and can elevate to the pull side.”

Given his performance with Greenville so far this season, White should be in line for a new challenge in the form of a promotion to Double-A Portland sooner rather than later. The biggest question at that point will be how he adjusts to more advanced, higher-quality pitching in the upper minors. If he can continue to refine his hit tool, however, he could climb prospect rankings across the industry.

(Picture of Mason White: Gwinn Davis/Greenville Drive)