SEATTLE (AP) - Struggling to get a base runner for 6 1-3 innings, the Seattle Mariners fought back and tied the game against the Baltimore Orioles on Tuesday night.

One pitch ended the chance at a win.

Baltimore starter Wei-Yin Chen didn't allow any Seattle runners until the seventh, and Robert Andino homered in the top of the ninth off Charlie Furbush to give the Orioles a 5-4 win over the Mariners.

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Furbush received the call with closer Tom Wilhelmsen not an option after pitching the prior three nights.

Left-handed Furbush (4-2) was a viable replacement in the crucial inning after the Mariners tied the game with three runs in the eighth. He had not allowed a run in 22 2-3 innings, the third-longest streak in Seattle history.

With two outs, Andino hit his fourth homer of the year and first since May 7.

``It was a two-seamer I wanted to have sink and it stayed flat,' Furbush said.

Baltimore reliever Pedro Strop struggled in the eighth when the Mariners rallied to tie the game. Michael Saunders' double ended Chen's night and Strop faced Justin Smoak, who was 2-for-2 with a walk in his career against Strop.

Smoak's single scored Saunders and John Jaso's pinch-hit single drove in Smoak following a Dustin Ackley single. Jaso is 4 for 10 this season pinch-hitting.

Strop walked Kyle Seager with the bases loaded to force in the tying run, ending his night after just one-third of an inning in which he allowed three hits, hit a batter, walked one and gave up two earned runs. Strop had allowed two earned runs in his prior 26 appearances combined.

Jim Johnson pitched a perfect ninth for his 24th save. Darren O'Day (5-0) pitched just one-third of an inning, but picked up the win.

Chen threw 7 1-3 innings, the first 6 1-3 perfect, allowed two hits and two earned runs while striking out a career-high nine. He said he didn't think about the perfect game.

Casper Wells' seventh-inning home run to left on a 3-2 pitch ended Chen's perfect run.

``I know you got to throw a strike - it's a perfect game - so I'm pretty much sitting dead red,' Wells said. ``I got a fastball I could handle.'

Chicago's Phil Humber threw a perfect game against Seattle on April 21.

``It was there for everybody,' Mariners manager Eric Wedge said of frustration of being no-hit for the majority of the game. ``That's why hats off to Casper for getting us off the hook.'

Smoak led off the sixth with a soft liner after Chen had an extended wait during the Orioles' four-run rally in the top of the inning. Ackley flew out to left and Brendan Ryan popped out in foul territory to catcher Matt Wieters.

Chen was never threatened in the first five innings. He struck out eight, including the side in the fifth, working a 93-mph fastball with an 80-mph changeup. His strikeout of Miguel Olivo for the second out in the fifth set a career-high in strikeouts.

The Mariners managed only one out in the outfield through the first five innings when Ichiro Suzuki flew to left leading off the game.

Brendan Ryan hit a line drive right back at Chen in the third that the left-hander snagged with his glove.

Baltimore pounced on Seattle starter Felix Hernandez in the sixth for four runs and knocked him out of the game. The Orioles started the inning with four consecutive singles from Xavier Avery, J.J. Hardy, Chris Davis and Adam Jones. Jim Thome grounded out, but Wieters singled to center to score two runs and chase Hernandez.

``I was feeling pretty good,' Hernandez said. ``They were good pitches, not in the middle, on the corners.

``The whole ballgame was that inning.'

Hernandez lasted 5 1-3 innings, and allowed four earned runs and eight hits. He struck out eight and walked none.

The first run of the inning snapped a 20-inning scoreless streak for Hernandez, who will be participating in next week's All-Star game. The 2010 Cy Young winner had allowed two earned runs over his prior three starts combined. The four runs were more than the Orioles had scored in 13 of the previous 16 games.

Ryan Flaherty's one-out single to right in the third was the first hit of the night off Hernandez. After Andino struck out, Avery, activated Tuesday, hit a broken-bat grounder to left that moved Flaherty to third. Hernandez powered out of trouble with a strikeout of Hardy, Hernandez's seventh strikeout in the first three innings.

``There was a lot of opportunity there to give in and keel over, but Robert had a big swing for us after a couple tough things,' Baltimore manager Buck Showalter said.

Notes: Baltimore placed second baseman Brian Roberts on the 15-day disabled list Tuesday because of a strained right groin. Xavier Avery was recalled from Triple-A Norfolk. . Mariners manager Eric Wedge said Franklin Gutierrez, who is on the seven-day disabled list because of concussion symptoms, is unlikely to be back prior to the All-Star break. . Seattle's Mike Carp (shoulder) participated in multiple batting practice sessions Tuesday, and will be worked back in primarily at first base. He is yet to throw. . Seattle introduced No. 3 overall pick Mike Zunino on Tuesday. Zunino and his family were at Safeco Field, and Zunino took batting practice, hitting a handful of home runs.