CINCINNATI -- The San Diego Padres rank among the major-league leaders in runs scored with two outs. On a sunny Saturday afternoon at Great American Ball Park, the Padres produced more two-out lightning.

Yonder Alonso belted a game-tying grand slam in the seventh inning and Matt Kemp had a homer and five RBIs, lifting the Padres to a 9-7 victory over the Cincinnati Reds.

Including Alonso's slam and Kemps' clutch hit, the Padres scored eight of their nine runs with two outs. They now have 112 such runs this season.

"That's our approach, putting pressure on the opposing pitchers," said Alonso, the Padres first baseman. "The key is to make sure you swing at strikes."

Kemp went 3-for-5 with a double, homer and the go-ahead two-run single in the eighth for San Diego (29-28), which has won seven of eight meetings against the Reds dating to last season.

The Padres right fielder hadn't homered since April 18, a span of 44 games.

"I never really worried about hitting home runs," Kemp said. "If I'm driving in runs, that's just as good as hitting home runs. I've never had a lot of success going out there trying to hit home runs."

Brandon Maurer (2-0) got the win, and Craig Kimbrel notched his 13th save for the Padres.

Shortstop Zack Cozart homered and third baseman Todd Frazier went 3-for-4, including two doubles, with three RBIs on Saturday for Cincinnati (23-31), which blew a five-run lead for the first time this season.

Jumbo Diaz (2-1) took the loss for Cincinnati, which jumped on Padres right hander Andrew Cashner for three runs in the first inning.

Frazier's two-run double over Will Venable's head in center put the Reds in front 2-0. Catcher Brayan Pena added an RBI double to drive home the third run.

Cozart's seventh home run of the season came on Cashner's first pitch with two outs in the third, making the score 4-0.

Cashner allowed a career-high seven earned runs in 5 2/3 innings. He has given up 12 runs in his past two outings.

"Too many balls in the middle of the plate, and up," said Padres manager Bud Black of Cashner's outing.

Rookie right-hander Michael Lorenzen made his sixth career start for the Reds, allowing three earned runs in six innings.

San Diego scored its first run on Kemp's second homer, which barely cleared the right-center field wall in the fourth.

Two misplays by Venable resulted in two runs for Cincinnati in the fourth.

First baseman Joey Votto's second triple of the season sailed over a charging Venable's head to drive home Lorenzen, who went 2-for-3.

Votto scored when Venable again charged in for Frazier's liner, only to see it go over his head for a double, making the score 6-1.

The Padres' comeback began when Kemp doubled home two runs in the fifth to make the score 6-3.

The tide turned for San Diego on a pair of two-out rallies.

After Ryan Mattheus struck out the first two batters in the seventh, catcher Derek Norris reached on an infield hit. Mattheus then walked two batters to load the bases.

"Good at-bats, that's something we talk about all the time," said Black.

On the ninth pitch of his at-bat against left-hander Tony Cingrani, Alonso launched a 3-2 pitch into the right-center-field stands for his second career grand slam, tying the score 7-7.

After Alonso's slam, Reds manager Bryan Price was animated during a meeting on the mound with Cingrani and again in the dugout between innings.

"The grand-slam wasn't irritating," said Price. "I just wanted us to continue to compete. There were times we could have taken charge of that game and we didn't."

Price's tirade didn't prevent San Diego from orchestrating another two-out rally in the eighth, capped by Kemp's bases-loaded single to drive home two ru