Making his debut on August 2008 aged 20 Cleffi has a so far mixed record of 7-2-0. Although he has been beaten previously, the future looks positive. Between August 2008 and November 2011, Cleffi had his longest winning streak of 5 fights. In his 9 fights, his longest KO streak is 2 fights long.
Cleffi fought and defeated Santos Galli in a successful 4 round debut. The decision was left to the judges after the final bell in a UD result favouring Cleffi. Following on from his debut, Cleffi continued his career by fighting in a further 5 fights. In this time he fought Nicolas Silva, Adan Martinez and Santos Galli to name just a few, fighting 2 times in 2008, didn't fight in 2009 and 3 times through 2010 and 2011 in this period.
On November 1st, 2008, Cleffi took on and was defeated by Jorge Gomez in his first career defeat meaning his career tally went to 1-1-0. Coming into the fight with high confidence Cleffi fought his next fight against Jorge Gomez on November 1st, 2008. Unfortunately, Cleffi was outclassed and lost the decision on the judges scorecards taking his record to 1-1-0. 5 wins followed for Cleffi including being the first to stop Angel oscar Zabala, first to stop Nicolas Silva and 3rd person to stop Marilson inacio Pereira (Round 5 TKO).
Taking a knock to his career, Cleffi fought and was defeated by Juan manuel Bonanni on December 17th, 2011 taking his record to 6-2-0. Cleffi fought a brave fight but in the end was outclassed by Juan manuel Bonanni over the 6 distance.
Fernando Cleffi added another win to his record by beating Nicolas Silva on June 23rd, 2012, upping his record to 7 wins. Cleffi successful career carried on with a fight against Nicolas Silva in 2012 which went the full 6 rounds. Cleffi was the 4th person to go the distance with Nicolas Silva where Cleffi added a further win to his successful career record.