Rosa vs. Saludar

On September 10, 2021, it was announced that Rosa would challenge WBA (Regular) mini flyweight titlist Vic Saludar. The fight was scheduled for December 9, 2021, at a venue to be determined, in Santo Domingo, Dominican Republic.^[10] The fight was later postponed for December 21, 2021, and was held at the Hotel Catalonia Malecon Center.^[11] Rosa won the fight by split decision, with two judges scoring the fight 116–109 and 113–112 in his favor, while the third judge scored it 113–112 for Saludar. Rosa scored knockdowns with a quick left in the third round, as well as with a left hook in the ninth round, while Saludar notched his sole knockdown with a right straight in the tenth round.^[12]

Rosa vs. Knockout

Rosa was expected to make his first WBA Regular title defense against the former WBC Silver minimumweight titleholder Carlos Ortega on July 15, 2022, in Santo Domingo, Dominican Republic.^[13] The fight was called-off by Rosa's promoter Shuan Boxing only hours before it was supposed to take place. Rosa and his team instead accepted a title unification offer made by the IBF mini flyweight champion Daniel Valladares.^[14] On September 30, 2022, Rosa was ordered to face Knockout CP Freshmart in a title consolidation bout.^[15] On November 24, it was revealed that the pair had reached terms for a title consolidation bout.^[16] The fight was expected to take place on December 17, 2022, on the undercard of the Frank Martin and Michel Rivera lightweight bout. It was later cancelled, as Knockout wasn't able to enter the United States due to a visa issue. This prompted the WBA to call for a purse bid, which was won by Petchyindee Boxing Promotions with a bid of $140,000. The title fight was booked to take place on March 1, 2023, in Nakhon Sawan, Thailand.^[17] Rosa and his team were briefly detained by the Thailand immigration officials upon arrival on February 20, due to an issue over the boxer’s visa status.^[18] Following their release on February 21, Rosa's promoter Belgica Pena announced that they withdrew from the fight.^[19]

The sanctioning body once again re-ordered Rosa to face Knockout in a title consolidation bout on March 16, 2023, and gave the two camps until March 28 to come to terms before a purse bid would be called, with a stipulation that the fight must be organized within 45-60 days from the time of the purse bid.^[20] They reached an agreement on March 27.^[21] Both sides would later default on this agreement, which forced the sanctioning body to call for a purse to be held on July 21, 2023.^[22] A week later however, the WBA allowed both Rosa and Knockout to pursue a non-title bout to avoid a lengthy period of inactivity.^[23] Rosa faced Orlando Pino on 25 August 2023, who retired from the bout at the end of the eighth round.^[24] Following this victory, the WBA gave Knockout and Rosa three final dates by which a title consolidation bout would have to be held: October 7, October 14 and October 19.^[25] Rosa vacated the championship after several failed attempts to secure a title consolidation bout.^[26]