Game in a nutshell: The first matchup between winning ballclubs from Washington and Baltimore in 42 years lived up to the billing, with Edwin Jackson and Jake Arrieta dueling each other on the mound. Jackson gave up one early run, then cruised. Arrieta cruised until serving up a solo homer to Ian Desmond in the sixth. That left this game in the hands of both bullpens. Tyler Clippard did his part in the top of the ninth, then Darren O'Day and Troy Patton retired the heart of the Nats' lineup in the bottom of the inning, sending this one to extras. That's when Nick Markakis took matters into his own hands, crushing a pitch from Ryan Mattheus off the facing of the second deck down the right-field line to give the Orioles an 11-inning victory before an energetic crowd of 36,680.
Hitting lowlight: They tried all night to get something going at the plate. In the end, Desmond's solo homer in the sixth represented the entirety of the Nationals' offensive effort. There were missed opportunities, and there was plenty of poor execution, especially during a failed seventh-inning rally. After Bryce Harper led off with a walk, Danny Espinosa fouled off a bunt with two strikes and Rick Ankiel and Jesus Flores each popped out.
Pitching highlight: The night started off really poorly for Jackson, who walked Xavier Avery to open the top of the first and then fell behind No. 2 hitter J.J. Hardy 3-0. But credit to the right-hander for bouncing back in a big-time way after that. Jackson didn't walk another batter all night and struck out eight over eight splendid innings. He also kept his pitch count to a relatively low 95, flashing shades of his complete-game win from last month.
Key stat: Desmond now has six homers. The only major-league shortstop with more this season is the Orioles' Hardy (nine).
Up next: Game 2 of this interleague series features a couple of starters who have surprised so far this season. Left-hander Ross Detwiler (3-2, 2.75) starts for the Nats against right-hander Jason Hammel (4-1, 2.68) for the Orioles. First pitch is at 7:15 p.m., with the game televised on Fox.