The Blue Jays have eight prospects out in the Arizona Fall League with the Mesa Solar Sox, and the assignment comes with a variety of purposes. For some, it’s about making up missed innings after injury. For others, it’s a chance to work on a new position, smooth out swing changes, or clean up the little things in their mechanics.
The numbers matter less than the reps at this stage, but the stat lines still tell a story. Toronto’s five pitchers have produced uneven results, with Jake Bloss standing out as the clear bright spot. The rest have mostly battled the same wildness the Blue Jays sent them there to fix.
Bloss is one of the few players in the AFL who has already reached the majors, but his journey has been shaped by injuries and inconsistency since the promise he flashed in the Houston system helped bring him to Toronto at the 2024 Trade Deadline. The Blue Jays see a possible role for him on the pitching staff in 2027, and because he is out of options, he could also give himself a real shot at breaking camp next spring as a multi-inning reliever or even a fifth starter, depending on what the club does over the offseason.
Toronto wants Bloss to pile up 15-20 innings in Arizona after he threw only 39.1 innings in the minor leagues this season and posted a 6.18 ERA. His Tuesday outing was the kind of step forward the organization was hoping to see.
#BlueJays' Jake Bloss just finished his best start of the AFL so far, striking out 6 and generating 6 whiffs on 17 swings in 2.2 innings of work. He was up to 95.6 mph with his fastball, allowed just a solo homer in the second and threw 28 of his 34 pitches for strikes.
The other four Toronto pitchers have combined to walk 20 batters and strike out only 15, and that kind of erratic command has not exactly come out of nowhere. None of those four are ranked among the Blue Jays’ Top 30 prospects by MLB Pipeline.
Toronto also sent three position players to Mesa, and one of them is Aaron Parker. Many Blue Jays fans know JoJo Parker, the club’s No. 1 prospect, but Aaron Parker is another Parker in the system, just one level above him.
The catcher put together a big year at Double-A, launching 19 home runs, but Toronto is trying him in left field in Arizona after he logged only three games there with New Hampshire. Behind the plate, he threw out only 14% of attempted base stealers, so the Blue Jays may be looking at him as something other than a catcher in the long run.
He opened the Fall League by homering on Monday and is hitting .368 with a .500 OBP.
Jake Casey, Toronto’s No. 23 prospect and the son of longtime major leaguer Sean Casey, is also in Mesa. Sean Casey earned the nickname “The Mayor” after his famously chatty approach in the Cape Cod League, where he was known for talking with just about everybody from concessionaires to runners standing on first. He was once voted the friendliest player in Major League Baseball.
Jake’s game is a little different. The Blue Jays sent him to the AFL to take advantage of his 60-grade speed.
Casey broke his hamate bone in his first game at High-A Vancouver, then came back to hit .243/.377/.504 with 13 home runs and 10 stolen bases. His Arizona start has been rough at the plate, though.
In 32 at-bats, he has more hit by pitches (5) than hits (3), and his 40% strikeout rate is more alarming than his .094 average. Still, he has swiped six bags, and the Blue Jays are using this time to let him tinker with his swing and make mechanical adjustments, so the results are secondary.
The third Toronto hitter in Mesa is Jake Cook, the Blue Jays’ third-round pick in 2025 out of Southern Miss and their No. 20 prospect. Cook is an elite athlete by any measure.
He ran the second-fastest time in MLB Draft Combine history at 3.51 seconds in the 30-yard dash, and he recently went from home to first in 3.81 seconds in an AFL game, just behind Chandler Simpson’s 3.78 seconds during the MLB playoffs. With an 80 grade for speed and a 65 in fielding, Cook is the fastest player in the organization and one of the quickest in the minors.
He also pitched in college and touched 96 mph, but the wildness was too much, so he gave that up and concentrated on center field.
That kind of speed can change the shape of a team, and the Brewers and Rays are reminders of how much value it can carry on defense and in putting pressure on the other side. Cook could be part of a more athletic Blue Jays group as the club works to move away from being one of the slowest teams in the majors.
Cook has held his own in Arizona, hitting .333 and ranking third in the AFL with eight steals. He stole 22 bases in 77 minor league games this season, though he remains a raw prospect after posting only a .738 OPS in A-ball.
Former Blue Jays prospect Arjun Nimmala is also playing for the Solar Sox, and he is batting .267/.400/.489. The Angels traded him to the Blue Jays for Jose Soriano at the trade deadline.
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