Martins attended
La Serna High School in
Whittier, California. After, he attended
Cerritos College and
Long Beach State. Martins was drafted by the
Oakland Athletics in the 17th round of the
1994 MLB draft. Martins played in the Athletics organization as an
infielder from 1994 through the 2000 season, reaching the
Triple-A level. He spent the 2001 through 2003 seasons in
independent baseball. In 2004, he played his final season with the
Nettuno Baseball Club in the
Italian Baseball League. Martins rejoined the Athletics organization in 2007 as a scout and remained in that role through 2014. In 2015, Martins transitioned to coaching and served as the
hitting coach for the
Midland RockHounds in 2015,
Nashville Sounds from 2016 through 2018, and
Las Vegas Aviators in 2019. On October 31, 2019, Martins was promoted to assistant hitting coach of the Athletics. On November 28, 2022, he was named Oakland's third base coach for the 2023 season. On November 5, 2025,
Ryan Christenson was hired as the team's first base coach, shifting
Bobby Crosby to the role of third base coach; the moves subsequently bumped Martins from his role. On February 6, 2026, Martins was announced as a player development instructor within the organization. ==References==