BALTIMORE -- Matt Wieters hit a walk-off home run in the 10th inning off Stolmy Pimentel early Friday to give the Orioles a 6-5 victory over the Pirates, completing a sweep of a long doubleheader that began Thursday afternoon.
The club stranded 15 runners in Game 2 after stranding 13 in Game 1's 5-1 loss. The Pirates' record is now 10-18.
Brandon Cumpton strengthened his case to stay in the starting rotation for the Pirates, throwing 5 2/3 scoreless innings in the second game before the Orioles plated four with two outs in the sixth.
The rally started when Adam Jones hit a deep fly ball to right field that a diving Travis Snider couldn't snag. That scored a run, and so did a single by Wieters.
Two more runs scored when J.J. Hardy doubled off reliever Bryan Morris to make it 4-4.
Starling Marte drove in a seventh-inning run to put the Pirates ahead again, 5-4, but Nick Markakis homered off of Morris in the seventh to tie it again at 5.
Gaby Sanchez had four hits in the game, including an RBI triple.
In the first game, Charlie Morton took the mound for a well-rested Pirates team that had not played since Sunday due to an off day and two rainouts.
Morton pitched well but was not the same after a 21-minute rain delay as the Orioles erased a 1-0 deficit with a three-run fifth inning en route to their 5-1 victory.
The Pirates offense was little help, stranding 13 runners. They managed one hit with a runner in scoring position, a two-out RBI single by Pedro Alvarez after a leadoff triple by Jose Tabata.
"(Charlie) really was challenged to get the ball down with any consistency after that (delay)," said manager Clint Hurdle. "He waited like a normal inning. He played catch to get extended and keep warm."
Morton gave up a leadoff single to Delmon Young to open the fifth and walked Steve Clevenger before J.J. Hardy reached on a throwing error by Alvarez to load the bases with no outs.
Steve Pearce hit an RBI single. Then Ryan Flaherty -- a college teammate and friend of Alvarez -- snuck an RBI double past Alvarez to make it 3-1 on a pitch Morton said had to be near his ankles.
"I don't know," said Morton. "I didn't execute and Bud (Norris) went through the same rain delay. I don't really know. I just didn't execute. I kept grooving fastballs to Pearce. He kept putting a good swing on it. That groundball to Flaherty to left field, the pitch was like a foot and a half off the plate at his ankles."
Morton finally got out of the inning, giving up two earned runs, three total.
He finished his night going 5 1/3, giving up seven hits, four runs (two earned), while walking two and striking out four.
Pearce drove in a fourth run in the sixth, and Markakis homered off of reliever Jeanmar Gomez in the seventh inning.
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