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Brayan Bello earned the win for Boston with four scoreless innings, yielding three hits.
Starter Ranger Suarez gave up three runs on four hits across 4 2/3 innings in his second start since returning from a groin injury.
Irvin's roster move came as Los Angeles placed reliever Brock Stewart on the 15-day injured list due to right shoulder discomfort and designated right-hander Chayce McDermott for assignment.
Dodgers manager Dave Roberts said Stewart's stint should be short-term, noting the team is being proactive to protect him.
Roberts added that the training staff views the placement as largely a formality and expects a quick return.
Discussing his return after elbow surgery, closer Edwin Díaz said he felt a little anxious in his first game back but threw strikes and secured the win.
Roberts noted Díaz's second appearance showed improvement and expressed satisfaction with having him back.
On roster construction, Dodgers president of baseball operations Andrew Friedman said having an acute need at the trade deadline is challenging because teams pay premium prices.
Maintaining flexibility puts the organization in a better position to be selective, he explained.
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The three-game series continues Saturday with Boston scheduled to start Payton Tolle against Los Angeles right-hander Yoshinobu Yamamoto.
