The 27-year-old Pomeranz is having the best season of his career, already reaching a career-high in innings pitched with 102. He was a late addition to the NL All-Star team, replacing injured Mets' pitcher Noah Syndergaard. This is the fourth time in his career that he has been traded.
Red Sox President Dave Dombrowski says Pomeranz will make his team debut on Wednesday, when they play host to the San Francisco Giants. To make room for their new addition, the team moved injured infielder Josh Rutledge to the 60-day disabled list.
The first-round pick of the Cleveland Indians in 2010 earned his first All-Star appearance after recording a 2.47 ERA in 17 starts. He ranks second in the majors with a .184 opponents' average, and .555 opponents' OPS. He's had a hard time holding a rotation spot with the Rockies and Athletics in the past, posting a 4.60 ERA in 228.2 innings as a starter.
Boston hopes to add support at the end of their rotation, which has a 7.22 ERA from the final two spots. This includes Eduardo Rodriguez, who had an 8.59 ERA in six starts since coming off the disabled list.
San Diego gets 18-year-old Espinoza, who is No. 14 on the top 50 prospect list. He has been compared to the likes of Pedro Martinez, but is not expected in the majors until 2019.
The Red Sox have one of the top offenses in the majors, and are in the middle of a three-team race in the AL East. With a balanced rotation from top to bottom, they could become an easy favorite to take home the division crown.