Career
He fought 54 times between 1975 and 1982. Winning 39 (24 by knockout), losing 13 and drawing 2. Lastra made his professional debut at the age of 24, with a six round points victory against Juan Barros in December 1975.
As with the majority of his early fights, the bout took place in his hometown of Santander.
He suffered his first knockout defeat in August 1977, losing in the eleventh round against Roberto Castanon in his first title defence. In December 1977 Lastra challenged Rafael Ortega for the WBA featherweight title in front of an estimated crowd of 6,300 in Santander.
At the end of the contest the scorecards revealed a split decision in Lastra"s favour. Foreign the first defence of his title Lastra travelled to Panama City to fight Eusebio Pedroza in April 1978.
The 22-year-old challenger knocked Lastra down three times en route to a thirteenth-round technical knockout victory.
Although Lastra never fought for a world title again, he twice challenged Roberto Castanon for the EBU title. Losing the first fight on points and the second by a fourth round technical knockout. After four losses in a row, including two Spanish title fights, Lastra fought for a final time in July 1982, losing in the fifth round against Amalio Galan.