The Arizona Fall League is still early, but the Mariners already have a few names worth watching in Peoria.
Seattle has eight players in the Peoria Javelinas’ mix, and the club has split its first eight games. The latest one was a loud 13-5 win over the Scottsdale Scorpions, highlighted by an 11-run fifth inning. That game offered a clean snapshot of where things stand for four Mariners in the AFL right now: two have jumped out fast, and two have stumbled out of the gate.
Matthew Ellis has been one of the bright spots. The catcher/first baseman drove Peoria’s offense on Tuesday, going 2-for-4 with a home run, four RBIs and two runs scored. That pushed him to seven RBIs in four AFL games.
It’s a strong follow-up to a regular season that didn’t draw much noise, even though Ellis quietly put together a solid line for High-A Everett. He wasn’t an everyday player for the AquaSox, but he still managed 17 home runs and an .845 OPS in 76 games.
At 26 and in the organization as an undrafted free agent, Ellis still fits the “depth” label more than the “prospect” one. But that kind of label can shift fast. Hunter Fitz-Gerald wasn’t exactly on the radar before a breakout 2026 season changed the conversation.
Adam Smith has also made a case for himself early in Arizona. The right-hander has worked three AFL games, covering 3.0 innings with two hits allowed, one run, no walks and three strikeouts. The overall line is tidy enough, but the eye-catching part came Tuesday, when those three strikeouts came in a row against Bryce Rainer, Jett Williams and Dakota Jordan.
Smith, like Ellis, is 26 and joined the Mariners as a free agent. His path was a little more winding, though. A 14th-round pick by the Padres in 2021, he was pitching in independent ball when Seattle brought him in.
On paper, he’s another organizational-depth arm. In practice, he’s closer to the big leagues than Ellis, thanks to a solid season in the system that included 55.1 innings, a 3.25 ERA and 17 appearances for Double-A Arkansas.
Not everyone in the Peoria group has started well. Boston Smith, the biggest name among Seattle’s AFL contingent, has been quiet through six games. He’s gone 3-for-20 with no extra-base hits.
That slow start comes after a major breakout season that vaulted the 23-year-old to No. 13 in MLB Pipeline’s Mariners top 30. More than Seranthony Domínguez, Smith is viewed as the major piece Seattle got back in the July trade that sent Luis Castillo to the South Side of Chicago.
There’s also a small red flag in the shape of September. Smith faded late in the minor league season, posting a .470 OPS that month. It’s fair to wonder whether the workload is catching up to him.
Reid Easterly’s AFL line has been rougher still. The left-hander has appeared in two games and thrown just 1.1 innings, and the results have been ugly: five earned runs on three hits, two walks and a hit-by-pitch.
That’s a sharp contrast to what he did for Everett. Easterly made 34 appearances there and finished with a 3.39 ERA over 66.1 innings. He was especially effective against lefties, holding them to a .222 average while striking out 28 and walking eight across 109 total plate appearances.
Easterly, 24, arrived as an undrafted free agent in 2025 after a college career split between Yale and Duke. The AFL debut has gone sideways so far, but his age and his left arm should keep him in the mix for more chances.
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