On, August 1, 2010, he won the Philippines Games and Amusement Board (GAB) strawweight title against Jetly Purisima via twelve round unanimous decision.

[1] On March 9, 2013, Sabillo defeated Colombia's Luis de la Rosa via 8-round technical knockout to win the interim WBO Minimumweight world title.

[4] On June 12, 2015, Sabillo defeated his fellow Filipino Countrymen Powell Balaba into a 6 round fighting contest that was held at the L' Fisher Hotel, La Proa Ballroom, Bacolod, Negros Occidental, Philippines.

In the end Sabillo fell short and the much younger Japanese Prospect Riku Kano wins the bout and the OPBF Minimumweight title.

[7] On November 11, 2016, the Former World Champion Merlito Sabillo was back to Japan for the second time as he faced the hard-hitting Japanese Professional Boxer Ryuya Yamanaka for the vacant OPBF Minimumweight title.

[11][12] On September 15, 2018 he fought the Chinese Fighter Jing Xiang for a vacant World Boxing Council Silver Light Flyweight title where he lost by unanimous decision.