Josh Kelly and Liam Smith both impressively won their fights in Arizona on Saturday night on the undercard to Daniel Jacobs vs Julio Cesar Chavez Jr.
Sunderland's Kelly first remained unbeaten by sauntering past Nicaragua's Campos via a 10-round unanimous decision.
It was Kelly's first outing since his draw against Ray Robinson in New York and, by outboxing Campos comprehensively, he has likely set up a European title challenge of David Avanesyan, an experienced champion from Russia who recently won via an ominous first-round knockout.
Kelly, in his second consecutive fight in the United States, was at his stylish best and almost completed a routine victory with a stoppage in the final round. Campos went down, but got up and survived.
The scores were 99-90 twice and 98-91 in favour of Rio 2016 Olympian Kelly who is now undefeated in 11 as he aims for major titles in 2020.
Smith then added a second British victory to the night, beating Roberto Garcia over 10 rounds by unanimous decision.
The Liverpool fighter's only two career defeats have come against Mexicans (Saul 'Canelo Alvarez and Jaime Munguia) in fights staged in the USA, but on this occasion, he comfortably beat his latest foe from Mexico.
Smith bullied Garcia in the early stages but his rugged rival, who also lost to Martin Murray last year, held on valiantly for the final bell.
Smith, a former world champion at super-welterweight, aims to secure another opportunity at a major honour next year.