Oakland Athletics Ynoa signed with the
Oakland Athletics of
Major League Baseball (MLB) for $4.25 million, setting a new record for the A's organization after lefty pitcher
Mark Mulder was signed for $3.2 million in 1998. Ynoa was named the "Number One" and the "crown jewel" in the "Best Latino Prospects of 2008." Ynoa was said to be the most impressive Latin American player prospect since
Félix Hernández in 2002. Two MLB teams (
Cincinnati Reds,
Texas Rangers) "reportedly offered Ynoa about $5 million." It was reported that Ynoa signed with Oakland after a deal fell through with the New York Yankees. The Yankees reportedly broke off talks with Ynoa after agent Adam Katz sought to renegotiate a handshake agreement with the club. In August 2010, after pitching nine innings in the
Arizona League, Ynoa underwent
Tommy John surgery, causing him to miss the 2011 campaign. He returned to action in 2012 with the rookie-level
Arizona League Athletics and Low-A
Vermont Lake Monsters. In 14 appearances (12 starts) for the two affiliates, Ynoa struggled to a 1-4 record and 6.46 ERA with 25 strikeouts across innings pitched. Ynoa's contract was selected by the Athletics on November 20, 2012, and he was added to the 40-man roster. Ynoa split the 2013 campaign between the Single-A
Beloit Snappers and High-A
Stockton Ports. In 22 appearances (21 starts) for the two affiliates, he posted a combined 3-3 record and 3.69 ERA with 68 strikeouts and one
save across innings pitched. Ynoa returned to Stockton for the 2014 season, compiling a 4-2 record and 5.52 ERA with 64 strikeouts in innings pitched across 31 games.
Chicago White Sox On December 9, 2014, the Athletics traded Ynoa and
Jeff Samardzija to the
Chicago White Sox in exchange for
Marcus Semien,
Chris Bassitt,
Rangel Ravelo, and
Josh Phegley. He made 28 appearances for the High-A
Winston-Salem Dash in 2015, registering an 0-2 record and 2.61 ERA with 40 strikeouts and six saves over 38 innings of work. Ynoa began the 2016 season with the Double-A
Birmingham Barons, and was promoted to the Triple-A
Charlotte Knights after three scoreless appearances. In 18 appearances for Charlotte, Ynoa logged a 1-3 record and 4.56 ERA with 20 strikeouts and four saves. On June 14, 2016, the White Sox promoted Ynoa to the major leagues for the first time. In 45 games over the 2016-2017 seasons, Ynoa compiled a 2-0 record, with a 4.42 ERA in 59 innings. He was released on March 15, 2018.
Kansas City Royals On November 13, 2018, Ynoa signed a minor league contract with the
Kansas City Royals. He was assigned to the Triple–A
Omaha Storm Chasers to start the 2019 season, for whom he posted a 1-1 record and 4.57 ERA with 26 strikeouts and two saves across innings pitched. Ynoa was released by the Royals organization on May 29, 2019.
Oakland Athletics (second stint) On February 12, 2020, Ynoa signed a minor league contract with the
Oakland Athletics organization. He did not play in a game in 2020 due to the cancellation of the minor league season because of the
COVID-19 pandemic. Ynoa became a free agent on November 2.
Acereros de Monclova On December 29, 2020, Ynoa signed a minor league contract with the
Philadelphia Phillies organization. Prior to the start of the season on March 27, 2021, Ynoa was released by the Phillies. On April 20, 2022, Ynoa signed with the
Acereros de Monclova of the
Mexican League. In 12 appearances out of the bullpen, Ynoa posted a 1–0 record with a 3.60 ERA over 10 innings pitched. He was released by the team on May 24.
Mariachis de Guadalajara On May 25, 2022, Ynoa signed with the
Mariachis de Guadalajara of the
Mexican League. In 13 games for Guadalajara, he logged a 1–2 record and 2.57 ERA with 17 strikeouts across 14 innings pitched. Ynoa was released by the Mariachis on July 9. ==Spelling of name==