Ronnie Ellis Williams (born January 6, 1996) is an American professional baseball pitcher for the Leones de Yucatán of the Mexican League. He has previously played in the KBO League for the Kia Tigers. He was drafted by the St. Louis Cardinals in the second round of the 2014 Major League Baseball draft.
Williams attended American Senior High School in Miami, Florida, where he played baseball and went 8âÂÂ2 with a 0.97 ERA as a senior.
After his senior year, he was selected by the St. Louis Cardinals in the second round with the 68th overall selection of the 2014 Major League Baseball draft. He made his professional debut with the rookieâÂÂlevel Gulf Coast League Cardinals, posting a 4.71 ERA in 10 appearances. Williams spent the 2015 season with the rookieâÂÂlevel Johnson City Cardinals, making 12 starts and going 3âÂÂ3 with a 3.70 ERA and 43 strikeouts in 56.0 innings of work. He split the 2016 season between the LowâÂÂA State College Spikes and SingleâÂÂA Peoria Chiefs. In 13 total starts, he accumulated a 5âÂÂ5 record and 3.40 ERA with 69 strikeouts in 82.0 innings pitched.
Williams returned to Peoria in 2017, making 36 appearances out of the bullpen but struggling to a 6.94 ERA with 95 strikeouts in 83.0 innings of work. In 2018, he pitched in 8 games for the HighâÂÂA Palm Beach Cardinals and the DoubleâÂÂA Springfield Cardinals of the Texas League, registering a cumulative 3.45 ERA with 15 strikeouts it s in innings pitched. Unfortunately missed nearly all of the season with an elbow injury. He spent the 2019 season again split between Palm Beach and Springfield. In 44 relief outings, he logged a 5âÂÂ5 record and 4.01 ERA with 58 strikeouts and 2 saves in innings pitched. Williams did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.
On December 10, 2020, Williams was selected by the San Francisco Giants in the minor league phase of the Rule 5 Draft. He was assigned to the Richmond Flying Squirrels of the Double-A Northeast to begin the 2021 season and was promoted to the Sacramento River Cats of the Triple-A West in early September. Over 29 games (five starts) between the two clubs, Williams went 6âÂÂ4 with a 2.77 ERA and 69 strikeouts over 78 innings. Williams elected minor league free agency after the season on November 7, 2021.
On December 26, 2021, Williams signed with the Kia Tigers of the KBO League on a $300,000 contract that included a $100,000 signing bonus. In 10 games (9 starts) for the Tigers, he registered a 3âÂÂ3 record and 5.89 ERA with 32 strikeouts in innings pitched. On June 29, 2022, Williams was released by Kia following the signing of Thomas Pannone.
On July 14, 2022, Williams signed a minor league contract with the San Francisco Giants organization. He made 10 appearances (9 starts) for the Triple-A Sacramento River Cats, posting a 1âÂÂ2 record and 7.64 ERA with 31 strikeouts in 33.0 innings pitched. He elected free agency following the season on November 10.
On May 2, 2023, Williams signed with the Diablos Rojos del México of the Mexican League. In 16 starts for the Diablos, he compiled a 4âÂÂ4 record and 3.24 ERA with 68 strikeouts across innings pitched.
Williams made 16 starts for México in 2024, registering a 5âÂÂ1 record and 5.13 ERA with 60 strikeouts across 72 innings of work. With the team, he won the Serie del Rey.
On February 5, 2025, Williams was traded to the Guerreros de Oaxaca. He was released by the Guerreros on April 11. The same day as his release from Oaxaca, Williams signed with the Tigres de Quintana Roo of the Mexican League. In six starts for Quintana Roo, he struggled to an 0âÂÂ3 record and 8.77 ERA with 14 strikeouts across innings pitched. On May 30, Williams was released by the Tigres.
On June 3, 2025, Williams signed with the Leones de Yucatán of the Mexican League. In 26 appearances (one start) for Yucatán, Williams compiled a 4âÂÂ1 record and 3.99 ERA with 39 strikeouts across innings pitched.
On August 21, 2025, Williams signed with the Cleburne Railroaders of the American Association of Professional Baseball. In 6 games he threw 9 innings of relief going 1âÂÂ0 with a 3.00 ERA with 11 strikeouts and one save.
On February 26, 2026, Williams returned to the Leones de Yucatán of the Mexican League.