BOSTON (AP) - David Ortiz has been in the middle of some of Fenway Park's greatest moments. None of them seemed more important to "Big Papi" than his role in one Saturday afternoon. Ortiz helped the Red Sox honor the victims and the survivors of the Boston Marathon bombings then played in his first game since last summer, a 4-3 victory over the Kansas City Royals capped by Daniel Nava's three-run homer in the eighth inning. "I try to take the positive side of things and ride with it," Ortiz said, sitting at a table in an interview room. But I wanted to win this game badly. The shirts will be auctioned off for a fund to support victims of the bombings. "I think today was different because we haven't been through what we've been through this past week," Ortiz said. Driving around and looking around at people's faces, it was a very emotional day here just looking at those guys that were injured by those bombs going off and watching the news nearly every day, it was painful, very painful. Today I could see people opening their chest and letting it go. Following the emotional pregame ceremony, the Red Sox won their sixth straight game - four since Monday's bombings at the marathon finish line. "Knowing everything that went into the day for the city, for us to get the win, it came in a special way, special fashion," Nava said. It made it all that more important. Cain went 4 for 4 with the solo homer, but it wasn't enough to slow down the hot Red Sox. "Just a fantastic finish to an otherwise great day," Red Sox manager John Farrell said. Cain even was moved by the pregame. "It was electric, man," Cain said of the ceremony. To go through that and see everybody getting into it and what this city went through, just to be a part of it was amazing. Herrera said it was a poorly thrown change up. "I left in the middle," he said. I paid the price. Shields entered just 2-9 with a 5.86 ERA in his career in Fenway. ... Boston OF Shane Victorino left the game with lower back tightness. Farrell said he "twisted a little awkwardly trying to lay down a bunt." He'll be reevaluated (Sunday) morning. ...