Guevara defeated Karluis Diaz on his 14th professional bout, claiming the WBC Silver light flyweight title.
In August 2012, Guevara challenged for a world title for the first time, facing IBF light flyweight champion John Riel Casimero on his native Mazatlán.
[4] Guevara regained the WBC Silver title on his next fight, beating Raúl García by split decision.
In December 2014, Guevara fought Akira Yaegashi for the vacant WBC light flyweight title in Tokyo.
The fight started as a slow, tactical affair, but Guevara pulled ahead with superior skills and more consistent work.
[11] On 22 October 2017, Kenshiro Teraji beat Pedro Guevara by majority decision in their 12 round contest for the WBC championship of the world.
[12] On May 12, 2024 in Perth, Australia, Guevara was scheduled to face Andrew Moloney for the vacant WBC junior bantamweight title.
[14] Guevara was scheduled to challenge Jesse Rodriguez for WBC super flyweight title on November 9, 2024 in Philadelphia, Pennsylvania.