10 College Baseball Seniors With Breakout Potential In 2027

MJ Bollinger, RHP, UConn

Bollinger’s 2027 season will be something of a reintroduction after redshirting at Texas A&M last season for reasons unrelated to injury. His most recent body of work came at Florida Atlantic in 2025, when he posted a 2.01 ERA with 39 strikeouts against 13 walks over 44.2 innings and 28 appearances.

Bollinger’s foundation is a 90-92 mph fastball that has reached 95 with above-average ride and run. He works from there with a four-pitch mix, though his secondaries are uneven. Bollinger’s best offspeed weapon is an above-average changeup that stands out thanks to its separation from his fastball and its effectiveness against opposite-handed hitters. He frequently uses a below-average upper-70s slider, and he’ll occasionally throw his slider with more tilt for slurvier action.

After a full season away from competition, Bollinger is a breakout candidate if he proves he can sustain the run prevention he showed at FAU and add more depth to his arsenal beyond his quality fastball-changeup pairing.

Phoenix Call, OF, UCLA

Call’s college career has never quite settled into a rhythm. Injuries and uneven playing time on deep UCLA rosters have limited his opportunities, and the production has followed suit. Across three seasons he owns a .241/.368/.328 line, including a .217/.387/.321 mark as a junior in 2026. The underlying offensive indicators were similarly light last spring, with a 79.6 mph average exit velocity and 98.9 mph 90th percentile mark, while his 71% overall contact rate and 76% zone-contact rate underscore how much work remains for the hit tool.

The appeal, however, has always started with his athleticism. Call is a no-doubt plus runner who spent most of 2026 at second base but will move full time to center field as a senior, a position that better suits his range, instincts and overall movement skills. His arm is sufficient for the position, and the speed gives UCLA a chance to extract far more value from him defensively than it could in the infield.

Now healthy, Call is also showing signs of a more compact swing and firmer contact this fall. The offensive track record still demands skepticism, but the circumstances are cleaner than they have been at any previous point in his career: a defined defensive home, a clearer path to everyday at-bats and a physical tool set that has always exceeded the stat line. If the swing changes hold, 2027 could finally be the season in which the athleticism begins to translate into sustained production.

Jack Cannon, OF, West Virginia

Cannon arrives at the high-major level after putting together a massive junior season at Le Moyne in which he batted .439/.505/.699 with 10 home runs, 19 doubles, a triple and 51 stolen bases in 55 attempts while also walking 25 times against 28 strikeouts. 

The 6-foot-3, 215-pound righthanded hitter has a quick, well-calibrated swing, decent strength and enough bat-to-ball ability to support an aggressive approach. He does his best damage in the air to the pull side, though his overall batted-ball profile remains groundball-heavy. His above-average speed plays up considerably on the bases because of his instincts.

The biggest variable is velocity. Cannon faced an average fastball of just 86.5 mph in 2026, and although he performed well against pitches at 92 mph or harder, he will now see that level of stuff far more consistently. His speed and instincts give him the tools to handle center field, but the real test will be whether the bat can scale with the competition.

Moving from the NEC to the Big 12 represents a substantial jump in competition, and the breakout we are projecting here is about whether that low-major dominance can translate against a much more demanding weekly environment.

Bristol Carter, OF, South Carolina

Carter brings South Carolina a sharply defined offensive identity: reach base, create pressure and turn speed into runs. The 5-foot-11 righthanded hitter began his career at East Carolina before spending two seasons at Auburn, where he hit .298/.428/.384 as a junior in 2026 with two home runs, seven doubles and 31 stolen bases in 32 attempts while drawing more walks than strikeouts.

There is little impact power here, but Carter’s game scarcely depends on it. He controls the strike zone, makes consistent contact and owns double-plus speed that changes the complexion of an inning the moment he reaches base. That athleticism carries into center field, where his range gives him another avenue to create value independent of what the bat produces.

For Carter, a potential senior-year breakout is less about becoming a different player than sharpening an already coherent one. His 70-grade speed is the carrying tool, supported by real hittability, on-base skill and premium-position defensive value. If he continues to turn plate appearances into traffic and traffic into pressure, Carter has the ingredients to make his lack of strength feel almost incidental.

Chase Mayer, LHP, Texas A&M-Corpus Christi

Mayer worked in a hybrid role last season, pitching to a 3.57 ERA with 53 strikeouts against 16 walks over 45.1 innings while collecting three saves and making five starts. A couple of those starts came late in the year, when he began to look increasingly comfortable turning a lineup over and carrying bat-missing stuff deeper into games.

There is little brute force in the arsenal. Mayer’s fastball sat just 87-88 mph and topped at 91, but solid ride, a favorable plane and plus extension allowed the pitch to play well beyond the radar gun. It generated a 29% miss rate in 2026, placing it among the 45 best individual pitches in the country by that measure among offerings thrown at least 450 times. He leans heavily on the heater, but there is more underneath it: a low-to-mid-80s changeup with fade and tumble, a high-70s sweeper and a mid-70s slurve with deeper two-plane shape. The latter two reflect his solid feel for spin.

Mayer is a deeper breakout bet because the arsenal still needs more power to keep climbing. But the fastball already misses bats at an unusual rate for its velocity, and a clearer path into the rotation gives him considerably more runway as a senior. If the stuff takes even a modest step forward, there is enough here for that late-season starting glimpse to become something much more substantial in 2027.

Jake McCoy, LHP, Tennessee

McCoy is a technical exception to this senior installment as he enters 2027 as a fourth-year junior after Tommy John surgery erased his entire 2026 season and allowed him to retain a year of eligibility. 

Baseball America had tabbed him as a prominent breakout candidate entering last spring, and after 14 starts as a South Carolina sophomore followed by an encouraging Cape Cod League stint with Harwich, McCoy appeared positioned to push himself firmly into the 2026 draft conversation before the injury reset his trajectory.

Now at Tennessee, the opportunity is as much about reclamation as breakout. McCoy works with a deep five-pitch mix—four-seam fastball, two-seamer, cutter, slider and changeup—and creates an unusual look from the left side with a lower three-quarters slot that helps the arsenal play beyond its raw characteristics. The appeal has always rested in that blend of angle, pitch variety and starter ingredients rather than gaudy results alone.

A healthy return would give McCoy the chance to recover much of the value lost to surgery. He entered 2026 with legitimate draft momentum. One year later, Tennessee offers a new stage to prove the stuff survived, the command returned and the pitcher Baseball America expected to break out never really disappeared.

Andrew Middleton, LHP, Maryland

Middleton’s college career has been measured more by rehabilitation than innings. The 6-foot-2, 215-pound lefthander threw just 35 innings across two seasons at UMass, underwent an internal brace procedure after tearing his UCL, and he’s recorded only one out since 2025 season, including a brief junior stint at West Virginia. Still just 21, Middleton took his talents to Maryland through the transfer portal this offseason.

The intrigue is concentrated in two pitches. Middleton’s fastball sits 89-92 mph but plays far beyond the velocity, routinely generating more than 20 inches of induced vertical break with cut-ride shape, strong extension and exceptional approach angles. The pitch stayed above barrels and produced a 50% miss rate in 2025, while his mid-70s curveball tunnels cleanly off it with sharp top-down action and flashes plus. That pairing helped Middleton strike out 54 batters in 35 innings at UMass, including 29 in just 11.2 frames in 2025.

Health and strikes remain the barriers. Middleton has issued 27 career walks, has yet to establish a repeatable delivery and has barely spent enough uninterrupted time on the mound to develop the rest of his arsenal. But that scarcity of innings also leaves unusual developmental runway: rare fastball shape, a bat-missing breaking ball and a physical lefthanded frame that has scarcely had the chance to become a finished product.

AJ Nessler, OF, Florida State

Nessler will spend 2027 at Florida State after an offseason in which he appeared open to beginning his professional career. Instead, the lefthanded-hitting outfielder returned to college for one more season, bringing with him a track record that culminated in a .310/.410/.496 junior year at Pittsburgh with nine home runs, six doubles, five triples and 13 stolen bases in 14 attempts. He also walked 36 times against 34 strikeouts—a clean reflection of the disciplined, contact-driven offensive game that has become his calling card.

The 5-foot-10, 190-pound Nessler is firmly hit-over-power in profile. His impact is slightly below average, but he controls the strike zone very well, seldom chases and makes above-average contact. The next frontier is trajectory, as too much of his best contact is driven into the ground, and even a modest increase in lift could give an already polished offensive foundation considerably more teeth.

Nessler’s raw speed is closer to fringe-average, but his instincts allow it to play beyond the stopwatch. He reads pitchers well, chooses his opportunities carefully and was caught just once in 14 steal attempts last season. Add steady center-field defense and a fringe-average arm, and the profile is less about one explosive tool than the way his plate discipline, contact, baserunning feel and some premium-position value all reinforce one another.

Cole Raile, C, VMI

VMI has produced its share of intriguing senior breakouts in recent years, including first baseman Grayson Fitzwater, one of Baseball America’s preseason breakout selections in 2026 and a White Sox draft pick this past summer. The Keydets are back on our radar this fall with Raile, a 6-foot, 215-pound catcher whose offensive development and all-around tool set make him a name worth following.

Raile has steadily reshaped himself as a hitter over the last three seasons. Once an aggressive righthanded bat with considerable swing-and-miss, he remains willing to let the bat go but now does so with substantially more control. There is still some miss in the profile, but Raile does not expand excessively for such an aggressive hitter and can punish pitchers who challenge him in the strike zone, where he posted an 87% contact rate in 2026. His plus raw power gives that contact real consequence, and continued refinement leaves room for a fringe-average hit tool to accompany it.

There is legitimate value behind the plate, as well. Raile is a fair receiver who handles pitches to either side effectively, though he is less adept at stealing strikes at the top and bottom of the zone. He moves well and owns plus arm strength, throwing out 20 runners in 2026. 

Raile is an average runner who can reach above-average speed once underway, but his quickness plays beyond the raw grade on the bases thanks to strong instincts and consistently good jumps.

Steve Solorzano, 1B, Missouri

Solorzano transferred to Missouri after three seasons at New Mexico State, where his junior year established a strong offensive foundation. The 6-foot, 190-pound righthanded hitter batted .341/.425/.572 with nine home runs, 22 doubles, two triples and nine stolen bases in 2026 while walking 24 times against 26 strikeouts.

His compact swing and aggressive approach produced above-average rates both overall and within the strike zone despite a swing rate near 50%, giving him a stable bat-to-ball base as he moves into the SEC. The next step is impact. Solorzano’s raw power is only fringy and has been suppressed further by below-average batted-ball angles. Even modest gains in how consistently he elevates the baseball could reshape the profile.

If the contact quality holds against better pitching and more of that contact begins to carry, Missouri could have a much more dangerous offensive player than the surface-level profile currently suggests.