PITTSBURGH -- Jeff Locke never lost his poise and gave the Pittsburgh Pirates a chance to get a win. Locke overcame a shaky start to pitch seven innings and Josh Harrison had three hits to extend his hot streak as the Pirates beat the Miami Marlins 7-3 on Wednesday night. Locke (3-3) gave up three runs in the first two innings, and then shut out the Marlins over his last five. The left-hander gave up six hits, no walks, and struck out seven, beating Miami for the first time in five starts. "Its easy to let things snowball, its easy to let things carry on," Locke said. "I settled down. I started to get more in control. I kept pounding the strike zone because good things happen when you do that." Christian Yelich hit a two-run homer that drew Miami within 4-3 in the second. The Marlins never scored again and Locke retired the last 13 batters he faced. "He was just persistent," Pittsburgh manager Clint Hurdle said of Locke. "It started with his confidence. He could find the (arm) slot and stay with it, (catcher) Russell (Martin) kept him in a good place to battle through the first two innings then he ran the table. Its as well as hes pitched all year." Harrison hit a double and scored twice. He is 20 for 44 during a 10-game hitting streak, with six doubles, one triple and five home runs. Ike Davis had a two-run double in a four-run first for Pittsburgh against Tom Koehler (7-9). Gaby Sanchezs two-run double capped a three-run seventh that pushed the lead to 7-3. Jeff Baker singled in a run in the first for the Marlins. Koehler was charged with four runs in six innings while allowing five hits and four walks and striking out four. It was the second time in his last nine starts that Koehler allowed more than three runs. "I made some good pitches early in the inning that they hit but then I started falling behind in the count and had to come in with my fastball," Koehler said. "Theyre a very good fastball-hitting team. You dont want to put them in fastball-hitting counts the way I did." Russell Martin hit an RBI single in the seventh to give the Pirates a 5-3 cushion before Sanchez broke the game open with his double. TRAINERS ROOM Marlins: Right-hander Jarred Cosart was scratched from his scheduled start Thursday night because of a strained left oblique muscle. Cosart felt discomfort in his side while playing catch Wednesday and the Marlins decided to have him skip a start. He is tentatively scheduled to pitch next Tuesday against St. Louis. The Marlins got Cosart last week in a trade with Houston. He made his Miami debut the next day and took the loss against Cincinnati, giving up four runs in 5 1-3 innings Friday. He was 9-7 with a 4.41 ERA with the Astros. . Reliever Kevin Gregg is expected to have surgery to remove bone chips from right elbow and miss the remainder of the season. . Right-hander Henderson Alvarez played catch before the game, the first time he had thrown since going on the disabled list July 30 with right shoulder inflammation. He is expected to be activated Aug. 15, the first day he is eligible. Pirates: Center fielder Andrew McCutchen missed his second straight game because of a fracture and cartilage damage in his lower left rib cage but remains hopeful of avoiding the disabled list. . Second baseman Neil Walker sat out for the third time in four games because of lower back tightness but is expected to return to the lineup Thursday. . Right-hander Gerrit Cole, will make a third rehab start for Triple-A Indianapolis with the date to be determined after he has a bullpen session Thursday. Cole has been on the DL since July 5 with a strained right lat. ON DECK Marlins: Rookie left-hander Brian Flynn (0-0, 6.00) will fill in for Cosart and start in the finale of the three-game series. Flynn was recalled from Triple-A New Orleans on Tuesday when right-hander Jacob Turner was designated for assignment. Flynn pitched once for the Marlins this season, allowing two runs in three innings June 27 against Oakland. Pirates: Right-hander Edinson Volquez (8-7, 3.91) is 5-0 with a 1.99 ERA in six career starts against the Marlins and looks to snap his three-start winless streak, which comes on the heels of a four-start winning streak. Air Max 95 Nere Scontate . The question is how many minutes will be available to them and can any of their defence or goaltending provide value? Top Picks: Following a down year in 2011-2012, Matt Duchene rebounded with his highest points-per-game (0. 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Stauskas took to Twitter shortly after to deny the report. "Just wanted to reiterate that any reports about my future intentions are FALSE! I have NOT made ANY decisions on my futuree yet!" said Stauskas in a Tweet.dddddddddddd The sophomore averaged 17.5 points per game this season and shot 44 per cent from three-point range. The Wolverines lost to Kentucky in the Elite Eight this year in the March Madness tournament. Fellow Canadians, Andrew Wiggins of Kansas and Tyler Ennis of Syracuse, have already declared themselves eligible for this years draft. ' ' '