The Astros have made a quiet but intriguing move to bolster their pitching depth, acquiring right-hander Kai-Wei Teng from the Giants in exchange for minor league catcher Jancel Villarroel.
Teng, 27, brings an interesting profile to Houston’s staff – one that might not scream “rotation lock,” but certainly has enough upside to keep an eye on. While his limited big league experience – just 12 appearances over the past two seasons with a 7.30 ERA – doesn’t jump off the page, there’s more to his story than those surface numbers.
At Triple-A Sacramento in 2025, Teng posted a 3.95 ERA and flashed the kind of strikeout stuff that keeps scouts intrigued. He punched out 89 batters in just 57 innings, thanks to a deep six-pitch arsenal that includes a fastball, cutter, slider, curveball, splitter, and changeup. That kind of mix gives him versatility, and it’s easy to see why the Astros might envision him as a long reliever who can eat innings or even serve as a spot starter if needed.
The issue – and it’s a significant one – has been command. Teng has walked 25 hitters in just 40.2 big league innings.
That’s been his Achilles’ heel at the highest level and the main reason he hasn’t stuck. But Houston has a track record of getting the most out of pitchers with raw stuff, and if they can help him harness his control, Teng could be more than just bullpen depth.
Born in Taiwan, Teng’s international status – including any potential participation in the next World Baseball Classic – remains unclear, but for now, his focus will be on carving out a role in Houston’s crowded pitching picture.
On the flip side, the Giants added 21-year-old catcher Jancel Villarroel, a prospect out of Venezuela who’s shown some promise in the lower minors. Villarroel reached High-A Asheville in 2025, where he posted a .699 OPS in limited action after putting up a .746 OPS at Single-A earlier in the season. He’s not a top-tier prospect, but he did rank 20th in the Astros’ system, according to Baseball America – a solid return for a pitcher the Giants may not have had long-term plans for.
For Houston, this is about adding another arm with upside to a pitching staff that always needs reinforcements over the course of a long season. For San Francisco, it’s a chance to get something back for a player who might’ve been squeezed out of the mix. It’s not a blockbuster by any means, but these are the types of moves that can quietly pay off down the line – especially if either Teng sharpens his control or Villarroel continues to develop behind the plate.
