Scouting Caleb Bonemer: White Sox Prospect Has Power, Needs Refinement

Body

Bonemer is listed at 6-foot-1 and 195 pounds, which passes the eye test. His body is mature and physical, without much remaining projection. He’s not the twitchiest athlete, which limits his quickness and range. His impressive strength shows up often in the batter’s box, where even his mis-hits traveled a long way.

Hitting

Bonemer starts his stance square to the pitcher, with his hands held over his shoulder and near his right ear and the bat cocked at a roughly 45-degree angle. He gets on his front toe pre-pitch before a moderate stride that usually is direct toward the pitcher. Bonemer has plenty of bat speed, and the strength in his forearms and wrists help him rack up extra-base hits even when he doesn’t make perfectly square contact.

Mechanically, there are no obvious red flags. The biggest area for improvement in Bonemer’s game will need to come in improved recognition and discipline against non-fastballs. In the first two games of my look, which came against a talented Frederick pitching staff, the scouting report was clear: Do not let him beat you on heaters. He was pitched backward early in games, and in two late-game, pressure situations, he got just one fastball, which was an unhittable pitch up and in used to set up a slider away that resulted in a weak pop up.

In the early days of the season, Bonemer has produced both average and power, but also struck out 14 times through 49 plate appearances (28.6%). A deeper look, via Synergy Sports, shows elevated velocity as a vulnerability, and he swung through two fastballs at the belt or higher during my three games. Closing those holes will be key areas of improvement before he’s ready to move to the upper levels.

Power

When Bonemer gets a hittable fastball, he’s usually on time. And when he’s on time, he has the strength and bat speed to put a charge into a ball. The best example during my look came against Orioles lefty Joseph Dzierwa, who had the Winston-Salem lineup in a chokehold for the majority of his outing. In the fourth inning, Dzierwa got Bonemer to swing through a fastball high and away for strike one, then got him to wave at a changeup for a second strike. When he went back to the fastball—once again, up and away—Bonemer didn’t miss. He reached out, put the barrel on the ball and sent a no-doubter to left field.

In the final game of my look, on April 14 against Asheville, Bonemer muscled another homer out to left field, and added two doubles for good measure. His first double was scorched, but the second came against a pitch he got fooled on but still hit the ball with enough authority to get it just over the head of Asheville outfielder Drew Brutcher. Bonemer has plenty of raw power, and with a better approach should be capable of plus power in the big leagues.

Speed

Bonemer’s home-to-first times during my series clocked in at 4.39 and 4.42 seconds, which for a righthanded hitter are 40-grade run times. There’s a little more in the tank when he gets going, but speed isn’t a strong point of his game and any baserunning value will come from instincts and feel for the game.

Defense

Though he is likely to get reps at shortstop throughout the season, Bonemer’s best bet on the infield will come at third base. He took all of his pregame work at the position in the game against Asheville, and six of his eight defensive starts this season have come at the hot corner. He is neither twitchy nor rangy, but he is mostly surehanded and should be able to make the routine plays at the position, though the trickier plays will require further reps. Before the season, some scouts have suggested that Bonemer might be worth a look in the outfield, though he’ll likely get plenty of chances to stick in the dirt.

Arm

Bonemer has enough arm strength to handle the hot corner, but he’ll need to hone in the accuracy a bit. He handled the routine plays with aplomb, even showing the aptitude to use an intentionally bounced throw to nab a runner without much speed.

In the first game of my look, he showed he’ll need to rewire his internal clock to better understand when he has time to set and throw and when he really needs to deliver a bolt across the diamond. His throw in the ninth inning—which came after he’d stepped on third base for what appeared to be the game’s penultimate out—was well wide of first base, allowing the tying run to score and sending the game into extra innings.

In the tenth, he did well to field a tricky hop on a high chopper, but he rushed his throw and short-armed it enough that first baseman Anthony DePino couldn’t corral it. Bonemer played some third base last season, but his defensive workload was tilted toward shortstop. In 2026, at least in the early going, the opposite is true, and he’ll get plenty of time to work out the kinks in his game.

Summary

Bonemer has the simple swing and enough strength to produce the kind of power necessary to profile at either third base or left field, both of which are possible defensive homes at the highest level. To get the most out of his offensive game, he’ll have to close holes against fastballs up and spin away. To stick at third base, he’ll need to improve his internal clock and shore up his arm accuracy. He has the upside of an everyday regular at either third base or an outfield corner, but without further improvement on both sides of the ball he might fit best as a low-average player who provides some thump on a second-division club.