César Valdez

César Miguel Valdez (born March 17, 1985) is a Dominican professional baseball pitcher for the Dorados de Chihuahua of the Mexican League. He has previously played in Major League Baseball (MLB) for the Arizona Diamondbacks, Oakland Athletics, Toronto Blue Jays, Baltimore Orioles, and Los Angeles Angels, and in the Chinese Professional Baseball League (CPBL) for the Lamigo Monkeys.

Career Arizona Diamondbacks Valdez signed with the Arizona Diamondbacks on May 2, 2005, as an international free agent. He made his professional debut with the Low-A Yakima Bears in 2006, posting a 7–5 record and 3.15 ERA in 16 games. In 2007, Valdez played for the Single-A South Bend Silver Hawks, recording a 7–10 record and 3.41 ERA in 25 appearances. The following year, Valdez split the season between the High-A Visalia Oaks and the Double-A Mobile BayBears, accumulating a 13–8 record and 3.14 ERA with 140 strikeouts in innings of work. For the 2009 season, Valdez played for the Triple-A Reno Aces, registering a 7–6 record and 4.78 ERA in 19 appearances. He was assigned to Reno to begin the 2010 season.

Valdez was promoted to the major leagues for the first time on May 3, 2010, and made his MLB debut later that day, pitching five innings of one-run ball against the Houston Astros. Valdez was designated for assignment on September 13, after recording a 5.90 ERA in 20 games in Reno and a 1-2 record, 7.65 ERA, and 13 strikeouts in 20 innings pitched across nine big league games with the Diamondbacks. On September 13, Valdez was designated for assignment following the promotion of Konrad Schmidt. He cleared waivers and was sent outright to Reno on September 16.

Pittsburgh Pirates On December 9, 2010, Valdez was traded to the Pittsburgh Pirates as the player to be named later (PTBNL) in a previous trade for Zach Duke. He began the 2011 season with the Triple-A Indianapolis Indians, logging a 3.86 ERA in 34 appearances.

Florida Marlins On July 5, 2011, Valdez was traded to the Florida Marlins organization for a PTBNL or cash considerations. He played in 8 games for the Marlins' Triple-A affiliate, the New Orleans Zephyrs, and recorded a 7.59 ERA with 13 strikeouts.

Toronto Blue Jays On July 28, 2011, Valdez was traded to the Toronto Blue Jays organization and assigned to the Triple-A Las Vegas 51s, but was released the following day without appearing in a game for the organization.

Vaqueros Laguna On March 14, 2012, Valdez joined the Vaqueros Laguna of the Mexican League. He made 24 appearances and pitched to an 11–8 record, 5.27 ERA, and 84 strikeouts in 135 total innings.

Rieleros de Aguascalientes On June 22, 2013, Valdez signed with the Rieleros de Aguascalientes of the Mexican League. Valdez was released on June 27 after making one start for the team, in which he allowed 4 runs in 4.2 innings of work. and became a free agent after the season.

Houston Astros On January 1, 2016, Valdez signed a minor league contract with the Houston Astros organization and was invited to spring training.

Oakland Athletics On November 17, 2016, Valdez signed a minor league contract with the Oakland Athletics organization. Valdez began the 2017 season with the Triple-A Nashville Sounds, and was recalled to the major leagues on April 21. After appearing in four games for Oakland with a 9.64 ERA, Valdez was designated for assignment on May 3.

Toronto Blue Jays (second stint) On May 5, 2017, Valdez was claimed off waivers by the Toronto Blue Jays and optioned to the Triple-A Buffalo Bisons. He was recalled on May 20, and optioned back down on May 26. In July, Valdez was recalled by the Blue Jays and added to the starting rotation after Aaron Sanchez was placed on the disabled list. On July 25, Valdez earned his first MLB win in over seven years, defeating the Oakland Athletics 4–1. In 2017 he threw a changeup 49.4% of the time, tops in MLB. In 7 big league games with Toronto, he posted a 6.75 ERA. Valdez was outrighted off of the 40-man roster on November 1, 2017, and elected free agency the following day.

Olmecas de Tabasco (second stint) On March 16, 2018, Valdez signed with the Olmecas de Tabasco of the Mexican League. He was released on May 1, after posting a 5.93 ERA in 7 appearances.

Leones de Yucatán On July 29, 2018, Valdez signed with the Leones de Yucatán of the Mexican League. He finished the year with Yucatán, recording a 5–0 record and 2.48 ERA in 6 appearances. In 2019, he pitched to a 15–2 record with a 2.26 ERA and 122 strikeouts across 147.2 innings, winning the league's pitcher of the year award and being named an All-Star. On January 4, 2020, Valdez requested and was granted his release in order to pursue an opportunity with an MLB-affiliated organization.

Baltimore Orioles On January 10, 2020, Valdez signed a minor-league deal with the Baltimore Orioles organization. Valdez did not play in a minor league game in 2020 following the cancellation of the minor league season because of the COVID-19 pandemic. Valdez was promoted to the active roster when the Orioles selected his contract on August 27. He pitched three scoreless innings in relief in his first MLB appearance in three seasons in a 5–0 loss to the Blue Jays at Sahlen Field two nights later on August 29. He earned his first MLB save with two shutout innings in a 6–3 win over the New York Yankees in the nightcap of a twi-night doubleheader at Camden Yards on September 4. In 2020 for the Orioles, Valdez pitched to an excellent 1.26 ERA with 12 strikeouts over 9 appearances. Valdez started out 2021 as the Orioles closer, recording 8 saves, however, he was moved out of that role after he began to struggle. In 38 appearances in 2021 for the Orioles, Valdez posted a 5.76 ERA with 44 strikeouts. On August 20, 2021, Valdez was designated for assignment by the Orioles, and subsequently outrighted to the Norfolk Tides on August 22. After posting a 1.42 ERA in 9 appearances with Triple-A Norfolk, Valdez was re-selected to the 40-man roster on September 21. He was designated for assignment by Baltimore the next day after another blown save. On October 5, Valdez elected free agency.

Los Angeles Angels On March 15, 2022, Valdez signed a minor league deal with the Los Angeles Angels. He was assigned to the Triple-A Salt Lake Bees to begin the year.

On May 17, 2022, Valdez was selected to the active roster. He allowed two runs on two hits while failing to strike out a batter against the Texas Rangers and was designated for assignment the next day. He cleared waivers and was sent outright to Triple-A on May 22. In Triple-A in 2022, he was 10–5 with a 3.94 ERA in 23 starts, and led the minor leagues in complete games with three. He elected free agency on October 6. On December 3, Valdez re–signed with the Angels on a minor league contract that included an invite to spring training.

Valdez began the 2023 season with Triple-A Salt Lake, making 7 appearances (4 starts) and posting a 7.27 ERA with 25 strikeouts in 26.0 innings pitched. On May 8, 2023, he had his contract selected to the active roster. He was designated for assignment the following day without making an appearance for the team. On May 13, he cleared waivers and was sent outright to Triple-A. On October 10, Valdez elected free agency.

Leones de Yucatán (second stint) On December 28, 2023, Valdez signed with the Leones de Yucatán of the Mexican League. In 18 starts for Yucatán, he compiled a 10–6 record and 4.06 ERA with 73 strikeouts across innings pitched. His 10 wins were tied for the league lead alongside Trevor Bauer and Juan Pablo Oramas.

In 2025, Valdez returned to Yucatán for a second straight season. In 17 appearances (16 starts), he posted a 7–5 record with a 5.86 ERA, 75 strikeouts, and 25 walks across innings pitched.

Valdez re-signed with Yucatán to start the 2026 season. In seven starts, he struggled to a 0–5 record with a 7.53 ERA, 26 strikeouts, and four walks over innings. On May 24, 2026, Valdez was released by the club.

Dorados de Chihuahua On June 5, 2026, Valdez signed with the Dorados de Chihuahua of the Mexican League.

Pitching style He primarily throws a changeup which he uses 81.3% of the time, tops out at 82 miles per hour and drops 8.5 inches more than the average for that type of pitch according to Statcast. He manipulates that changeup to function like at least five to six different pitches by alternating arm angles and grips. Orioles catcher Pedro Severino explained, "It’s not a normal changeup. I call it a slider-changeup because I don’t know where it’s going." Valdez also has a sinker at around 85-90 mph.