Aaron three-run homer). The Mets won 11–6, however, then won the next game to complete the series sweep. Koosman was the pitching star of the 1969 World Series against the Baltimore Orioles. After Seaver was defeated in Game One, Koosman, leading 1–0, held the Orioles hitless until Paul Blair singled to lead off the bottom of the seventh inning, eventually scoring on Brooks Robinson's only hit in 19 Series' at-bats. The Mets regained the lead in the top of the ninth; Koosman got two outs in the bottom of the frame, then walked the next two batters. He was relieved by Ron Taylor, who induced Robinson to ground out to end the game. With the Series shifting from Memorial Stadium to Shea Stadium for the next three games, the Mets won Games Three and Four, and Koosman took the mound for Game Five. He fell behind 3–0 in the third inning after giving up home runs to his mound opponent, Dave McNally, and Frank Robinson. The Mets, however, cut into the Oriole lead on Donn Clendenon's two-run home run in the sixth, then tied the game in the seventh on a homer by Al Weis, who had hit only six career homers at that point—none of which had been in a home game. The Mets scored two runs in the eighth to take the lead, and after walking Frank Robinson to lead off the ninth, Koosman retired the next three hitters to end the game and complete the Mets’ improbable World Series win. Game ball for game 5 After catching Davey Johnson's fly ball for the final out of the World Series, left fielder Cleon Jones gave the game ball to Koosman. That ball, as well as the game ball from Game 2, was stored in a safe in Koosman's residence. In the early 1990s, Koosman sold the ball from Game 5. The Game 5 ball's current whereabouts are unknown. "Ya Gotta Believe!" and "It Ain’t Over 'til It's Over" In Koosman posted a 12–7 record with a 3.14 ERA. Over the next two seasons, however, he posted losing records: 6–11 in (a season in which he was beset by arm woes) and 11–12 in with a 4.14 ERA—more than a run and a half above his career ERA to that point. In he went 5–0 in his first six starts, but ended the season 14–15. In late August/early September