The Brewers–Cubs rivalry is a Major League Baseball (MLB) rivalry between the Milwaukee Brewers and Chicago Cubs. Both clubs are members of MLB's National League (NL) Central Division. The rivalry is also sometimes known as the I-94 Rivalry, because the two teams' ballparks are located only from each other off Interstate 94 (I-94). The Brewers and Cubs have been playing each other in spring training Cactus League games since the Brewers franchise began as the Seattle Pilots in 1969. However, the rivalry did not begin until , when the Brewers moved from the American League (AL) Central Division to the National League Central. Until then, the Brewers had a rivalry with Chicago's AL team, the White Sox. The Brewers-Cubs rivalry has been ranked among the best and most competitive in baseball. The teams have never met in the postseason. Background 1997–1998: First meetings The Brewers and Cubs met for the first official time on June 13, 1997 in interleague play, a 4–2 Brewers victory at Wrigley Field in Chicago. They met for the first time as division rivals on June 15, 1998, a 6–5 Cubs victory also in Wrigley Field. 1999–2016: Geographic foes and division races After battling for the NL Central title in both 2007 and 2008, the teams met at Miller Park for the Brewers' home opener in 2009. During the second game of the series on April 11, the Brewers had the highest attendance in Major League Baseball for the rivalry game. During games in Milwaukee, it was sometimes common for there to be many Cubs fans in attendance. This has been largely due to the ticket availability at Miller Park; Wrigley Field has routinely sold out in the past, so it has often been easier and cheaper for Cubs fans to watch games at Miller Park (with Amtrak's Hiawatha Service providing low-cost access between both cities and trains often packed during rivalry games either way), leading Cubs fans to call Miller Park by the derisive nickname of "Wrigley North". During the 2006 season, the Milwaukee Brewers started the "Take Back Miller Park" campaign to regain home field advantage. Since then, the dominating presence of Cubs fans has somewhat dwindled as the Brewers have become more popular with local fans following the sale of the team from Bud Selig to Mark Attanasio. Through the 2007 and 2008 seasons, the rivalry became more intense with both teams battling