Before Sunday's game, Cubs manager Dale Sveum joked that he may use outfielder Brian Bogusevic as a reliever because the bullpen was a little taxed. Sveum didn't need to resort to that, and Bogusevic chipped in with one of six doubles in the game as the Cubs held on for a 7-6 Interleague victory over the Mariners. Anthony Rizzo drove in two runs to back Edwin Jackson as Chicago won its second straight road series. Jackson gave the Cubs the innings they needed after back-to-back extra inning games. Sveum had a longer list of pitchers unavailable than ones who were on call. "If we could get back to Little League days [and play seven innings], we'd be OK," Sveum said. After blowing his first save of the season on Saturday, Kevin Gregg converted his 13th save to seal the win with a 1-2-3 ninth. "He ended up having his best velocity of the year today," Sveum said of the right-hander. "I thought my fastball was coming out all right [Saturday], and it was even better today," Gregg said. "I got back into a groove today using my fastball more than I have in the last couple outings." Was it important to get in another game quickly after the blown save Saturday? "I want to pitch every day," Gregg said. "Coming off a blown save yesterday, I want to get right back out there. I don't want to sit at all." Jackson struck out six and scattered seven hits, including Jason Bay's solo homer, over six-plus innings. The right-hander's best outing of the season had been his shortest and didn't count. He faced eight batters on May 28 against the White Sox, struck out three, and gave up one hit before rain washed out the game. "It's been a very inconsistent first half," Sveum said of Jackson. "The fastball command, the velocity are what bothers me as much as anything. Some days it comes out 97-[mph], and other days it comes out 90, 92. We need that guy to let it go." Jackson did hit 97-mph on the radar gun on Sunday. "For me, [velocity] is [velocity]," Jackson said. "I've had games when I've come out and hit 96, 97, and gotten hit. It's the best of both worlds. If you can come out and have the velo and have the location with it, it's great. The days you can come out and let it go, it's definitely not a problem to have. You can come out and attack hitters." Jackson did what the Cubs needed, which was keep the Mariners in check and go six innings. The right-hander, who signed a four-year, $52 million deal this offseason, had high expectations in his first year with the Cubs. At the halfway point, he's 4-10 with a 5.75 ERA.