Guerra was called up to the Dodgers on May 15,2011 and made his debut in the ninth inning against the Arizona Diamondbacks,working a scoreless inning. On May 24 he was credited with his first career save by pitching a scoreless ninth inning against the Houston Astros. On June 4 he earned his first win by pitching the tenth inning and part of the eleventh,allowing one run in an 11-8 victory against the Cincinnati Reds;he also batted for himself and drew a base on balls. With Jonathan Broxton out for the year with injuries,Guerra became the Dodgers closer for most of the season. He finished with a 2-2 record,2.31 ERA and 21 saves.
Guerra began 2012 as the Dodgers closer and picked up saves in his first five chances and seven of his first eight,but then he went through a period where he blew two of his next three opportunities and also pitched poorly in some non-save appearances. As a result,he was dropped from the closer role in favor of Kenley Jansen.[1] He was later demoted to the Triple–A Albuquerque Isotopes in August.[2] Guerra rejoined the Dodgers when rosters expanded in September,but suffered a strained oblique and was placed on the disabled list for the remainder of the season.[3] Overall,he appeared in 45 games for the Dodgers in 2012,with a 2-3 record,2.60 ERA and 8 saves.
On November 2,Guerra underwent arthroscopic right shoulder surgery,his third different surgery in 2012.[4] He returned in time for spring training,but his injury kept him from participating in the 2013 World Baseball Classic.[5][6] He also suffered a groin strain during spring training and the setback led to him falling behind the other relievers and he was optioned to Albuquerque to start the season.[7] He spent the bulk of the season there,appearing in 27 games (including 4 as a starter) and was 0-4 with a 3.66 ERA and 12 saves. He also appeared in 9 games with the Dodgers in May and had an ERA of 6.75.[8]
The Chicago White Sox claimed him off waivers on March 26,2014.[10][11] On March 28,the White Sox outrighted him to the Triple–A Charlotte Knights.[12] He was called up to the majors in May.[13] Guerra was designated for assignment by the White Sox on May 6,2015. On July 8,Guerra was suspended 50 games for drug abuse.[14]
Los Angeles Angels
On February 10,2016,Guerra signed a minor league contract with the Los Angeles Angels. He was designated for assignment on May 13. He was called back up by the Angels on June 1 and designated for assignment on June 7.
Miami Marlins
On December 17,2016,Guerra signed a minor league contract with the Miami Marlins.[15] He was outrighted to the Triple–A New Orleans Baby Cakes on October 7,2017.
Guerra re–signed with Miami on a minor league deal on January 13,2018. Guerra had his contract selected on July 9. In 2018 with Miami he was 1-1 with one save and a 5.55 ERA in 32 relief appearances. Guerra was removed from the 40–man roster and declared free agency on October 12.[16]
Toronto Blue Jays
On January 10,2019,Guerra signed a minor league contract with the Toronto Blue Jays.[17] On March 28,Guerra was added to the 25-man roster for Opening Day.[18] He was designated for assignment on April 18 to make room for Ryan Tepera who was activated from the 10 day injured list.[19] His contract was selected on May 10,and he was called up to the major league roster.[20] He was designated for assignment again on May 18.[21] With the Blue Jays in 2019 he was 0-0 with one save and a 3.86 ERA in 11 relief appearances.[22]
Washington Nationals
Guerra was claimed off outright waivers by the Washington Nationals on May 20,2019.[23] He was designated for assignment on July 31. He had his contract selected for a second time on August 4. In 2019 with the Nationals he was 3-1 with one save and a 4.86 ERA in 40 relief appearances.[citation needed] Guerra pitched the ninth inning of Game 2 of the World Series,allowing a solo home run to Martín Maldonado in a 12-3 Nationals win over the Houston Astros.[24] He was non-tendered by the Nationals on December 2,making him a free agent. To remain in the Nationals organization,Guerra subsequently signed a minor league deal with an invitation to major league spring training.[25] On July 23,2020,Guerra's contract was selected to the 40-man roster. On October 12,Guerra was outrighted off the roster and subsequently elected free agency.[26] On December 21,Guerra re-signed with the Nationals organization on a minor league contract.[27]
On August 3,2021,Guerra's contract was selected by the Nationals,[28] but he was again designated for assignment on August 22. In 6 games for the Nationals,Guerra struggled to a 16.50 ERA with 4 strikeouts. On August 22,Guerra was designated for assignment by the Nationals.[29] On August 24,Guerra cleared waivers,but rejected his outright assignment and elected free agency.[30]
Toros de Tijuana
On April 9,2022,Guerra signed with the Toros de Tijuana of the Mexican League.[31] He pitched in 31 games for Tijuana,posting a 2-2 record and 3.21 ERA with 31 strikeouts in 28 innings pitched.[32]
Guerra made 43 relief appearances for Tijuana the following year,registering a 2–4 record and 5.77 ERA with 25 strikeouts across 34+1⁄3 innings pitched. He retired from professional baseball following the 2023 season.[33]
Coaching career
On February 5, 2025, the Athletics hired Guerra to serve as the pitching coach for their Double-A affiliate, the Midland RockHounds.[34]
Guerra was born in Denton, Texas. His mother and father were both born in Mexico, his mother lives in Denton, Texas and his father makes his home in Múzquiz, Coahuila.[36] Guerra lives in Phoenix during the offseason.[37]
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