Liendo started his career aged 19 on November 2013. His career record to date stands at 6 wins and he remains unbeaten. Between November 2013 and November 2017, Liendo had his longest winning streak of 6 fights. In his 6 fights, his longest KO streak is 1 fights long.
An explosive pro debut saw Liendo face Mario jesus Gonzalez in a 4 round debut fight. Sergio manuel became only the 16th person to stop Gonzalez shy of the full distance, stopping him in the 1st. Taking his record to 3 wins, Liendo won his next 3 fights continuing his successful career.
Pablo joel Fernandez was up next for Liendo on August 30th, 2014. Liendo continued with his winning streak by beating Fernandez. Liendo was the first person to go the distance with Fernandez. Liendo fought Pablo joel Fernandez in 2014, the result was a solid win to Liendo. Liendo then went on to win again against Jonathan joel Casafu setting him up well for his next pro fight.
On December 19th, 2014 Liendo fought and beat Hector Alejandro Videla (0-1-0) to continue his unbeaten streak. Showing his class against Videla, Liendo was the 2nd person to go the distance with this opponent.
Next was Sergio alejandro Blanco on September 11th, 2015 where Liendo took the win continuing his unbeaten streak. Liendo secured the win over Blanco after the final bell via UD, resulting in Liendo being the 28th person to defeat Blanco.
Ensuring he remained unbeaten, Sergio manuel Liendo defeated Dario nestor Baigorria on November 17th, 2017 in his most recent fight. Only the 16th man to defeat Baigorria, Liendo made an impressive appearance in his latest outing, earning himself a UD win.