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CINCINNATI -- Memo to Reds' clubhouse staff: Buy more shaving cream. Fast.

Rookie catcher Devin Mesoraco capped a series full of homers with his first career grand slam on Thursday night, leading Cincinnati to a 6-3 victory and four-game sweep of the Atlanta Braves.

Mesoraco delivered the grandest homer in a series full of them. He pulled the ball down the left-field line and watched it fly straight rather than tailing foul.

"That's kind of why I paused at the plate at the start," Mesoraco said. "I wasn't sure it was going to stay fair, but it stayed true. It didn't tail. That's a pretty good sign for me as a hitter."

Right now, everything's going the Reds' way.

The Reds completed their first four-game sweep of the Braves in Cincinnati since 1980 at Riverfront Stadium. They've won six straight, their longest winning streak since August 2010 when they started their push toward the NL Central title by taking seven in a row.

The teams combined for 16 homers -- 13 solo shots -- accounting for 21 of the 24 runs in the series.

Mesoraco connected off Kris Medlen, who relieved Randall Delgado (2-5) with the bases loaded in the sixth. Drew Stubbs added a solo shot for Cincinnati.

Homer Bailey (3-3) gave up four hits in six innings, including Michael Bourn's two-run homer. Bailey got back-to-back wins for the first time this season, coming off a victory in Yankee Stadium on Saturday.

Logan Ondrusek pitched the ninth for his second save in three chances, giving up a pair of singles before getting a double play.

The Reds hadn't hit a lot of homers heading into the series. During the four games, every solid hit seemed to reach the seats.

"They come in bunches," manager Dusty Baker said. "Guys are finding their strokes and confidence, big-time."

The Braves have their first four-game losing streak since they dropped the first four games of the season. They'll remember this one as four bad days in one of the majors' most homer-friendly ballparks.

In a free-swinging series, they couldn't keep up.

It didn't help that they were missing two of their top hitters. Third baseman Chipper Jones was limited to one pinch-hit appearance because of a bruised left calf. Catcher Brian McCann missed the last three games with an illness.

"They're definitely rolling right now," catcher David Ross said of the Reds. "They've got a lot of confidence. Their pitching staff is better than I think people give them credit for. And we're a little banged up right now, not 100 percent."

Cincinnati won the series opener with four solo homers, three of them in a row. Todd Frazier's solo shot in the ninth on Wednesday night sent them to a 2-1 win, the first game-ending homer of his career.

Frazier got a face full of shaving cream, then a dousing from the dugout water cooler, to celebrate his winning homer.

Frazier also doubled home the first run off Delgado, who gave up seven hits and three walks in 5 1/3 innings. Delgado hasn't won since April 17, going 0-5 with two no-decisions.

Cincinnati's third grand slam of the season provided the finishing touch.

Mesoraco, who hadn't homered since April 27, pulled a 2-0 pitch that stayed just inside the left-field foul pole. He walked a few feet down the line, holding his bat while watching to see if the ball stayed fair, then put his head down and rounded the bases on his fourth major league homer.

The 23,312 fans also made him come out for a curtain call.

Bourn hit a two-run homer in the fifth off Bailey, his third homer of the series. He also had his first multihomer game during the series. Juan Francisco added a solo homer.

The Reds honored Jones before the game, presenting him with one of the bases as a memento of his last trip to Cincinnati. Jones plans to retire after the season. He got a standing ovation from the crowd after highlights of his career were shown on the videoboard.

Game notes

The Braves return home for a six-game series against Washington and St. Louis. The Reds conclude a weekend homestand with a weekend series against Colorado. ... Reds reliever Nick Masset made about 30 throws before the game, the first time he's thrown a ball while recovering from an inflamed right shoulder. He's scheduled to throw again on Friday. The setup man has been on the DL since spring training.