5 Costliest (and Cheapest) Tickets in Interleague Baseball

Kansas City Royals at St. Louis Cardinals
June 15 at Busch(BUD) Stadium
Ticket prices: $17 to $199

When purists argue against interleague play, this series is usually Exhibit A of their evidence to the contrary. This was a great matchup in 1985, when the Royals beat the Cards for their last World Series title, but it's been a bit lacking since. The Royals haven't made the playoff since and haven't had a winning season since 2003. The Cardinals, meanwhile, have had only one losing season since 2000 and have won two World Series in that span. The Cards hold a 38-28 edge over their Show-Me State rivals, which may be driving down demand a bit.

San Francisco Giants at Oakland A's
June 22 at O.co(OSTK) Coliseum
Ticket prices: $31 to $255

It doesn't matter if it's the 49ers and Raiders or Giants and A's: A Bay Area matchup is going to sell regardless of how either side is doing. The Bay Bridge Series hasn't been kind to the Moneyball boys from Oakland lately, though, as the Giants have held a 13-8 advantage since 2009. That includes a 3-3 split in 2010 that the Giants happily took en route to a World Series Title. The Athletics still lead the series 46-43 since 1997 and won the teams' only World Series matchup in 1989, but that's of little consolation when the Giants are contenders in the NL West while the A's are battling Seattle for last place in their division.

Washington Nationals at Baltimore Orioles
June 22 at Oriole Park at Camden Yards
Ticket prices: $13 to $268

Two first-place teams in the Beltway Series? Oh, it's true. Since helping the Boston Red Sox finish their late-season collapse in spectacular fashion last year, the Orioles snagged the top spot in the AL East and have had a tenuous hold on it since. The Nationals' high-powered pitching hoisted them atop the NL East, but their time there has been similarly fragile as the Braves, Marlins and Mets keep chipping away. The Orioles have built a 21-18 lead since the series began in 2006, but both teams' recent success have added some rancor to what was already a natural rivalry.