Lopez (15-9) took the loss against Boston in the first game of Sunday's doubleheader, allowing seven earned runs on nine hits and one walk while striking out three in four innings.
Lopez was unable to limit the long ball in this one, as he allowed a pair of three-run home runs to Triston Casas, who finished the day with three homers. Lopez matched his season-worst mark with seven earned runs, allowing two or more home runs for the first time since June 18. Despite Sunday's setback, Lopez has still been excellent overall since the All-Star break, logging a 2.74 ERA, 1.18 WHIP and 69:15 K:BB in 75.2 innings (12 starts) since the intermission. The 28-year-old is scheduled to make his final regular-season start next weekend against Baltimore.