The love between brothers is key to Matt Tavares's tale of Dominican pitcher Pedro Mart nez, from his days of throwing rocks at mangoes to his years as a major-league star. Before Pedro Mart nez pitched the Red Sox to a World Series championship, before he was named to the All-Star team eight times, before he won the Cy Young three times, he was a kid from a place called Manoguayabo in the Dominican Republic. Pedro loved baseball more than anything,...