Scouting Report

Scouting grades: Fastball: 50 | Curveball: 55 | Slider: 55 | Changeup: 50 | Control: 55 | Overall: 50

Lin was one of three players handed a seven-figure bonus by the A’s during the 2024 international signing period, and it’s hard to argue against him being the best of the group based on his early success. The Taiwanese left-hander jumped straight to the full-season California League for his professional debut in 2025, moved up to High-A Lansing after just 13 games and finished the season helping out Double-A Midland in a playoff run. Between the three levels, Lin posted a 3.72 ERA in 26 games (13 starts) with 117 strikeouts and 22 walks over 87 innings in his age-19 campaign.

The 6-foot-2 southpaw boasts a diverse pitch mix. His fastball velocity dipped to around 90-92 mph over the second half of ‘25, but the organization believes that was due to fatigue over his first full year and expect him to tick back up to around 95-96 mph. Lin’s slider tilts and bends to create plenty of swing-and-miss. His curve is his top breaking ball offering with good snap, while his changeup has flashed plus as he’s tinkered with a vulcan-like grip with it. Lin also has a splitter in his arsenal, though the A’s advised him to throw it less as the season went on.

Lin has stood out with a fun personality and confidence on the mound as a great competitor. His greatest strength is his ability to control each of his offerings, throwing strikes at will. That showed in his first year with his impressive strikeout-to-walk ratio (5.32). If he can get that velocity back up to where the A’s expect him to be, his ceiling could push up to that of a front-end starter. His stock has soared over the past year, making him a candidate for a fast rise through the system.

Scouting grades: Fastball: 50 | Curveball: 50 | Slider: 45 | Changeup: 50 | Splitter: 45 | Control: 55 | Overall: 40

The A’s were very aggressive in acquiring talent on the international amateur market during the 2024 signing period, handing out three seven-figure bonuses. Two hitters, Venezuelan outfielder Jose Ramos and Dominican shortstop Edgar Montero, each got $1.2 million at the start of the period in January, but then the A’s went to the Far East to sign Lin, a Taiwanese left-hander for $1.13 million in June. The 19-year-old has jumped straight to the full-season California League for his pro debut in 2025, with solid early returns.

A 6-foot-2 left-hander, Lin has a combination of feel for as many as five pitches and projection to his frame. Right now his fastball averages just 91 mph, but it tops out at 95, and it’s easy to see that his frame has tremendous room to add good strength, with more consistent velocity to come. It already had the makings of a quality heater, thrown from around a 5.9-feet release height and with more than 18 inches of carry to it, helping it to miss a good amount of bats. His changeup has been his best secondary offering to date, with huge whiff rates during his debut. His short curve is his go-to breaking ball thus far, though he has a harder, shorter slider. He’ll also employ a splitter for another offspeed possibility.

It’s been a small sample size so far in his first full season, but Lin looks like he has the makings of being an extreme strike-thrower, showing particularly good command of his fastball and curve. If the teenaged southpaw is able to fill out and throw harder, the A’s could have a very interesting left-handed starting pitcher prospect on their hands.

Awards

CAL Pitcher of the Week

Week	Team
04/06/2025

Transactions

Team	Date	Transaction
	03/05/2026	LHP Wei-En Lin assigned to Athletics Prospects.
	02/05/2026	Chinese Taipei activated LHP Wei-En Lin.
	01/28/2026	Athletics invited non-roster LHP Wei-En Lin to spring training.
	09/02/2025	LHP Wei-En Lin assigned to Midland RockHounds from Lansing Lugnuts.
	08/09/2025	Lansing Lugnuts activated LHP Wei-En Lin from the 7-day injured list.
	07/29/2025	Lansing Lugnuts placed LHP Wei-En Lin on the 7-day injured list.
	06/24/2025	LHP Wei-En Lin assigned to Lansing Lugnuts from Stockton Ports.
	06/24/2025	Lansing Lugnuts activated LHP Wei-En Lin.
	04/03/2025	LHP Wei-En Lin assigned to Stockton Ports.
	02/03/2025	LHP Wei-En Lin assigned to Chinese Taipei.
	06/13/2024	ACL Athletics activated LHP Wei-En Lin.
	06/13/2024	ACL Athletics activated LHP Wei-En Lin.
	06/13/2024	LHP Wei-En Lin assigned to ACL Athletics.
	06/04/2024	Oakland Athletics signed free agent LHP Wei-En Lin to a minor league contract.