PITTSBURGH -- Speculation has been swirling around the Pittsburgh Pirates in recent weeks that they are pursing starting pitching in the trade market.

Left-hander Jeff Locke, the No. 5 starter, made his case Saturday that the Pirates might not need to add another starter.

Locke retired his last 19 batters to end a strong eight-inning performance and second baseman Neil Walker singled home the only run as the Pirates beat Cleveland 1-0 to snap the Indians' five-game winning streak.

"I had to hit against him, so I saw up close how good his stuff was today," losing pitcher Cody Anderson said. "I could see why we had so much trouble with him. He had good stuff and also good command."

Locke (5-4) allowed two hits in eight innings -- second-inning singles by catcher Yan Gomes and rookie third baseman Giovanny Urshela. The left-hander did not allow anyone else to reach after Urshela's two-out hit as he struck six, walked none and faced just one batter over the minimum.

"I had a really good rhythm and it's almost like an added confidence," Locke said. "You almost feel superior until someone on the offense, on their side tries to knock you out of it. Fortunately enough, they did hit some balls hard and guys were there."

The Pirates (46-34) scored in the sixth inning after third baseman Josh Harrison hit a leadoff double off the top of the center-field fence and scored on Walker's single. Walker ran his hitting streak to seven games.

The Indians (38-42) never got a runner past first base. The Pirates turned double plays in each of the first two innings in winning for the 10th time in 15 games.

Locke has given up two earned runs or less in each of his last five starts. However, he didn't make it past the fifth inning in his two outings after running up high pitch counts.

Locke was much more efficient with his pitches this time, throwing just 89.

"We've seen it in stretches before, the volume of work today," Pittsburgh manager Clint Hurdle said of Locke. "Even the counts he got behind, he came right back.

"I really believe that every time he gets the ball he expects to win and go deep. That's one of the things that I've always appreciated about him, that I've always believed about him and you've seen him continue to fight."

Closer Mark Melancon pitched a scoreless ninth for his 26th save. He got center fielder Michael Brantley to ground out to end the game after second baseman Jason Kipnis walked and rookie shortstop Francisco Lindor hit an infield single with two outs.

Harrison had two of the Pirates' six hits.

Anderson (1-1) was the tough-luck loser in his third major league start. He gave up only one run and six hits in eight innings, with his ERA rising slightly to 0.76 from 0.57. He had no walks and four strikeouts.

"I'm just going out on focusing on what I have to do to help our team win," Anderson said. "I'm just trying to do the best I can and then use tomorrow to get better."

Urshela extended his hitting streak to 13 games with his single. Kipnis has reached base in 27 of his last 29 games.

"Their guy did a good job of pounding the strike zone today and we weren't able to take advantage that much," Walker said. "Fortunately, one run was enough and Jeff had his best outing of the year."

NOTES: Indians OF Ryan Raburn usually starts against left-handers but was not in the lineup Saturday because he was feeling "under the weather," according to manager Terry Francona. Raburn is hitting .313 against lefties this season in 96 at-bats. ... Indians CF Michael Bourn was rested in a day game following a night game that ended at 12:26 a.m. after going 2-for-3 with a double, three RBIs and a walk in Friday night's 5-2 win over the Pirates. LF Michael Brantley started in center field and INF/OF Mike Aviles played left field. ... The three-game series concludes Sunday with Cleveland RHP Danny Salazar (7-3, 3.80 ERA) facing Pittsburgh RHP Gerrit Cole (11-3, 2.20 ERA). Salazar took a perfect game into the sixth inning in his last start on Tuesday at Tampa Bay and wound up pitching a season-high 7 2/3 innings and allowing two runs. Cole is 6-1 with a 2.01 ERA in his last eight starts.