Walk-off win: Chris Davis' single in the 13th provides victory over Boston

Finally, they won it.

Chris Davis' RBI single in the last of the 13th gave the Orioles a 6-5 walk-off win over Boston. It was their ninth walk-off win of the 2015 season as Davis drove in his 107th run.

Gerardo Parra led off the 13th and drew a five-pitch walk from Jonathan Aro, the eighth Boston pitcher. Manny Machado followed with a single to center, which put runners at the corners with no outs. At that point, Robbie Ross Jr. replaced Aro. Davis lined a 2-1 pitch to right to end the game.

Chaz Roe, the seventh O's hurler on the night, got the win with a scoreless top of the 13th. The O's bullpen allowed just one run in eight innings tonight.

The game tied for the longest of the year by innings for the Orioles.

With their sixth win in the last seven games, the Orioles are 71-73. They are 11-4 against Boston (68-76) and have won nine of the last 10 against the Red Sox. They are 7-1 at Camden Yards versus Boston.

After Boston starter Joe Kelly struck out the side in the second, the Orioles scored four off him during a third inning where he would leave with the trainer. Kelly left after 2 1/3 innings due to right shoulder tightness and fatigue.

J.J. Hardy started the Baltimore third with a single and scored on Steve Pearce's two-run homer. Pearce hit No. 11 on a 2-2 hanging curveball for a 2-1 lead. The Orioles used three singles, an error and a Matt Wieters sac fly to add two more runs that inning for the 4-1 edge.

The Red Sox rallied to tie the game 4-4 in the fifth as Xander Bogaerts, David Ortiz and Pablo Sandoval drove in runs. Ubaldo Jimenez left after five innings, allowing six hits and four runs with three walks and four strikeouts.

Not long after Boston scored three runs in the top of the fifth, Machado untied it in the last of the inning. His solo homer to right-center on an 0-1 pitch from Craig Breslow gave the Orioles a 5-4 lead. It was homer No. 20 for Machado.

Mychal Givens gave the Orioles a strong relief outing tonight, pitching 1 2/3 scoreless innings and holding the 5-4 lead. He gave up a leadoff double to Rusney Castillo in the sixth, but stranded him at third and fanned three during his 27-pitch, 20-strike outing. Left-hander Brian Matusz ended the seventh by getting Ortiz to ground out. Ortiz is now just 3-for-28 versus the O's left-hander.

But Boston got back even in the eighth when lefty-batting Travis Shaw homered to right off Matusz. Shaw hit a 2-1 fastball at 90 mph out for his 11th homer and a 5-5 tie. Left-handers were batting .152 against Matusz before tonight. Six of Shaw's 11 homers have come off southpaws.

Kelly had been 8-0 with an ERA of 2.59 his previous eight starts, but got a no-decision. It was the longest run of wins by a Boston pitcher since Pedro Martinez won nine games in nine starts from April 20-June 4, 1999. Kelly has an ERA of 7.71 in three starts this season against Baltimore.

The Orioles and Red Sox wrap up this series on Wednesday night when Mike Wright (2-4, 5.45 ERA) pitches against left-hander Henry Owens (2-2, 5.25 ERA).

Baysox fall: In Game 1 of the Eastern League finals tonight, Reading beat Bowie 3-1. The Baysox were held to six hits and failed to score until the top of the ninth. Losing pitcher Joe Gunkel gave up three runs over six innings. Reading hosts Game 2 of the best-of-five series on Wednesday night.