Although Marcelino nicolas Lopez has been beaten in his career, with a fight count of 31 fights and a 7 year long career he approaches the end of his career with a record of 29-1-1. He made his debut in December 2006 at the age of 20. Lopez's longest KO streak is 3 fights long out of his 31 career fights.
In his debut fight, Lopez's became only the 2nd fighter to go the distance with Juan manuel Flores, winning by UD in round 4 of 4. Continuing on from his successful debut, Lopez continued his winning streak by winning his next 16 fights. In this time he fought and beat Miguel dario Lombardo, Sergio javier Escobar and Gonzalo gabriel Ovando to name just a few, fighting once in 2006, 8 times in 2007 and 7 times through 2008 and 2009.
On June 15th, 2007 Lopez fought and beat Jose edgardo Soraire (1-4-0) to continue his unbeaten streak. Showing his class against Soraire, Lopez was the 2nd person to go the distance with this opponent. 15 wins followed where Lopez went on to be the 3rd person to go the distance with Flavio dario Pedemonte, 5th person to stop Javier osvaldo Alvarez (Round 2 TKO) and 8th person to stop Ricardo fabricio Chamorro.
On September 10th, 2010 Lopez fought and beat Jeremias ezequiel Castillo (15-4-1) to continue his unbeaten streak. Lopez was the first person to stop Jeremias ezequiel Castillo and he did it in the 6th round via RTD. Lopez's win streak of 19 rose to 28 following 9 wins against boxers such as Humberto Martinez, Sidney Siqueira, Fabian Marimon and 6 others.
On May 30th, 2014, Lopez went into action again and beat Sergio javier Escobar taking the winning record to 29 wins. Lopez's MD win against Sergio javier Escobar came via judges decision of a 10 round fight. Lopez became the 21st person to defeat Escobar and secured a great win.
On July 25th, 2014, Lopez took on and was defeated by Pablo martin Barboza meaning his career tally went to 29-1-1 A confident Lopez came against his biggest challenge to date on July 25th, 2014, being out-boxed in a 10 round UD loss to Barboza on the judges decision. This was Lopez's first defeat as a pro.