![](https://s.hdnux.com/photos/01/02/32/17/17408988/6/rawImage.jpg)
Luis Castillo: How onetime Giants farmhand became the Reds' ace
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.cincinnati.com/gcdn/-mm-/db9b97136ec54d2679181803c3f92682ddd59a7d/c=0-72-2947-1737/local/-/media/2018/04/22/Cincinnati/Cincinnati/636600192346275079-AP18112672396268.jpg)
Cincinnati Reds right-hander Luis Castillo has struggled so far
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](http://assets.sbnation.com/assets/1540161/posey-latos-grand-slam.gif)
The Cincinnati Reds might have an ace in Luis Castillo - Red Reporter
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://media.bleacherreport.com/image/upload/v1652816719/yeoffxemrlhuf9aab4ac.jpg)
MLB Trade Rumors: Luis Castillo, Tyler Mahle Interest Giants; Mets Linked to Mahle, News, Scores, Highlights, Stats, and Rumors
MORE
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.cincinnati.com/gcdn/authoring/video-thumbnails/1ca5c76f-d7a7-430a-b205-91e58d0063a4_poster.jpg?width=660&height=371&fit=crop&format=pjpg&auto=webp)
Luis Castillo traded to Mariners: The starts that defined Reds career
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://image.isu.pub/230310192841-dec0425d74d477f94bf5f31fba0410b3/jpg/page_1.jpg)
2023 Portland Sea Dogs Game Day Program by Portland Sea Dogs - Issuu
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://redlegnation.com/wp-content/uploads/2019/03/newplot-49.png)
How Luis Castillo can become an ace — Part One - Redleg Nation
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.si.com/.image/t_share/MjAwMjUxMTI3MDg4ODE3MjYw/luiscastillo.jpg)
Mariners Ace Luis Castillo Threw 47 Consecutive Fastballs Against the White Sox - Sports Illustrated
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.cincinnati.com/gcdn/presto/2022/03/23/PCIN/4a6b370b-e00e-416d-b5d6-1f5e4bdba549-032322_REDS_0430.jpg)
Luis Castillo impresses Reds teammates, coaches behind the scenes
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.cincinnati.com/gcdn/presto/2019/04/16/PCIN/9311899a-ce71-46e9-8b32-191defc8bbc7-USATSI_12539577.jpg?crop=2727,1528,x0,y108&width=2727&height=1528&format=pjpg&auto=webp)
Luis Castillo doesn't run out would-be single, thrown out from RF
Reds' first-inning homers not enough vs. Giants
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.si.com/.image/ar_4:3%2Cc_fill%2Ccs_srgb%2Cfl_progressive%2Cg_xy_center%2Cq_auto:good%2Cw_1200%2Cx_1634%2Cy_893/MTkxMTgwNDA1NTM2MjA0MDEx/luis-castillo-june-28-2022.jpg)
The Cleveland Guardians Shouldn't Trade For Cincinnati Reds Pitcher Luis Castillo - Sports Illustrated Cleveland Guardians News, Analysis and More
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://images.squarespace-cdn.com/content/v1/5b6f00df96d45509545b2660/1696912943248-MQNDAC08N9XVJBHNSO37/2023-topps-update-header1.jpg?format=1500w)
2023 Topps Update Series: Product Preview — Prospects Live
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](https://www.cincinnati.com/gcdn/presto/2022/07/28/PCIN/93a7004c-e22b-44d2-87d0-a7d89e700a58-072722_REDS_0017.jpg)
Luis Castillo traded to Mariners: The starts that defined Reds career
![Luis Castillo: How onetime Giants farmhand became the Reds' ace](http://blogs.fangraphs.com/wp-content/uploads/2022/07/USATSI_18578547.jpg)
Reds' Haul for Luis Castillo Creates Enthralling, Volatile Immediate Future