SP: Masahiro Tanaka, RHP, New York Yankees (31)
While Tanaka’s current elbow injury obviously is worrisome, the 25-year-old right-hander is still young and already has proved to be an elite starting pitcher just halfway into his first professional season.
SP: Hunter Harvey, RHP, Hunter Harvey (24)
Harvey, 19, projects as future front-of-the-rotation arm like fellow first-rounders Dylan Bundy and Kevin Gausman, and he has the potential to reach the major leagues faster than his high school peers from the 2013 draft class.
SP: Yu Darvish, RHP, Texas Rangers (32)
Darvish has the pure stuff to be a perennial All-Star and headline a starting rotation the foreseeable future, though there are concerns about his durability due to the heavy workload early in his career.
SP: Daniel Norris, LHP, Toronto Blue Jays (26)
Norris has shot up the prospect rankings this year with his success between the High-A and Double-A levels, as the 21-year-old the left-hander has improved his delivery and shown the ability to consistently miss bats with an advanced four-pitch mix.
SP: Taijuan Walker, RHP, Seattle Mariners (26)
Walker has flashed his front-of-the-rotation ceiling over five starts in the major leagues, and considering he’s still only 21, the right-hander could be hitting his stride in 2019.
SP: Henry Owens, LHP, Boston Red Sox (26)
Owens, 21, is currently in Double-A and already knocking on the door of the major leagues, and it’s easy to envision the 6’6” left-hander making strides with his command over the next five seasons.
SP: Dylan Bundy, RHP, Baltimore Orioles (26)
Bundy reached the major leagues in 2012 as a 19-year-old but was forced to miss the next year-and-a-half after undergoing Tommy John surgery. Well, the now-21-year-old right-hander is swiftly working his way back up the ladder and likely to rejoin the Orioles rotation during the second half.
RP: Mike Foltynewicz, RHP, Houston Astros (27)
The Astros have remained steadfast in their development of Foltynewicz as a starting pitcher, but his ongoing command issues and the fact he boasts a legitimate triple-digit fastball (especially when working in short bursts) could finally lead to a move to the bullpen in the coming years.
RP: Dellin Betances, RHP, New York Yankees (31)
Betances, a first-time All-Star this year, has been the nastiest and most effective non-closer in the major leagues this season, as the 26-year-old right-hander enters the All-Star break with the highest Fangraphs WAR (2.1) among all relievers.
RP: Sean Doolittle, LHP, Oakland Athletics (32)
Doolittle, 27, has been a revelation for the A’s in his first full season as a closer, highlighted by a ridiculous 63-2 strikeout-to-walk ratio in 43.2 innings at the All-Star break. His contract includes team options both for the 2019 and 2020 seasons, which means the left-hander could hold down his current role for a long, long time.
RP: Cam Bedrosian, RHP, Los Angeles Angles (27)
Bedrosian has been one of the more dominant relievers in the minor leagues this year, despite his inconsistent showing during several stints with the Angels, but the right-hander has the makings of an impact closer once fully developed.
RP: Alex Meyer, RHP, Minnesota Twins (29)
Meyer, 24, has been developed as a starter and likely will be given an opportunity to prove himself in the role at the highest level, but the 6’9” right-hander’s power arsenal also suggests a bright future as late-inning reliever.
RP: Luke Jackson, RHP, Texas Rangers (27)
Jackson, 22, has figured things out as a starting pitcher over the last two seasons and moved up the organizational ladder as a result, but the right-hander also flashes big-time potential as a reliever thanks to his ability to miss bats with a mid-90s fastball and swing-and-miss curveball.
Honorable Mentions: Felix Hernandez (SEA), Chris Sale (CHW), Tyler Skaggs (LAA), Aaron Sanchez (TOR) and Jose Berrios (MIN).