SAN FRANCISCO -- Twenty-four hours after being boarded onto a plane and flown across the country, Miami Marlins left-hander Chris O'Grady got a different kind of a ride Saturday night.

It was in a laundry cart and into a shower of beer, shaving cream and assorted other clubhouse goodies, including ketchup.

"That was a first," O'Grady assured minutes after he'd accomplished another first -- the first win of his major league career in a 5-4 victory over the San Francisco Giants.

Marcell Ozuna drove in two runs with a pair of hits and Justin Bour belted his 20th home run of the season, helping the Marlins build a 4-1 lead they were able to turn into a series-clinching win over the Giants.

"It's what I've been working for my whole life," gushed O'Grady, a career minor-leaguer who had been released by the Los Angeles Angels in April. "A dream come true. Everything I would ever imagine it to be, and more. Really cool.

"No, I didn't throw six shutout innings. But I'm glad I did enough to get us a lead and the bullpen took over to get us a win."

The 27-year-old handed his dad the game ball after the win, and shortly thereafter was handed the ball with which he recorded first strikeout. That occurred in the first inning, when he got All-Star Buster Posey with two on and one out.

"Not who I was expecting to get my first strikeout," he noted.

The celebratory shower followed.

"They said jump on in there," O'Grady said of the cart ride from his locker to the shower area. "I really didn't know what was going on. They put a lot of stuff on me."

Ozuna's RBI singles came in the first and fifth innings, building a lead O'Grady and five relievers were able to hold to the end.

O'Grady (1-0), promoted from Triple-A New Orleans on Saturday, pitched one out into the sixth inning. He allowed three runs and five hits, walking two and striking out four.

"I thought he did a nice job," praised Marlins manager Don Mattingly, who had never seen O'Grady pitch before. "Pretty good for a guy's first start. In this place."

The Giants closed within 4-3 in the sixth on an RBI double by Brandon Belt and run-scoring infield out by Brandon Crawford.

But left-hander Jarlin Garcia, the third Miami pitcher, got Gorkys Hernandez to pop out with the potential tying run on third base, protecting O'Grady's lead.

After Kyle Barraclough and David Phelps pitched a scoreless inning apiece to keep the score at 4-3 entering the ninth inning, the Marlins got a critical insurance run on a double by JT Riddle, a sacrifice bunt by pinch hitter Ichiro Suzuki and a two-out wild pitch by George Kontos.

Four of the Marlins' five runs came off Giants starter Jeff Samardzija (4-10), who also allowed nine hits in seven innings. He walked one and struck out five.

Miami closer A.J. Ramos allowed a leadoff walk to Crawford and one-out single to pinch-hitter Conor Gillaspie in the ninth, bringing the potential go-ahead run to the plate, but then struck out Denard Span.

Joe Panik singled in Crawford to get the Giants within 5-4 before Ramos struck out Hunter Pence with pinch runner Mac Williamson at third base for his 16th save.

"That last inning," O'Grady admitted, "I was just as nervous as I was in the first inning."

The Marlins bullpen pitched 3 2/3 innings of two-hit, one-run ball in relief of O'Grady.

"A good rally. I'll take that," Giants manager Bruce Bochy said of the ninth. "We had a good hitter up there."

Ozuna, Christian Yelich and J.T. Realmuto had two hits apiece for the Marlins, who improved to 5-4 on their 10-game trip.

Belt had two hits and Crawford drove in two runs for the Giants, who have lost three straight.

Miami outhit San Francisco 10-7.

For the second night in a row, the Marlins gave their starting pitcher a cushion before he took the mound.

After scoring four times in the first in Friday's series opener, they settled for two this time on a game-opening single by Dee Gordon, an RBI double by Yelich and a run-scoring single by Ozuna.

"The first inning is a critical part of the game," Bochy lamented. "That's a good lineup. To try and navigate that lineup, it's not easy. They have speed at the top and a power hitter in the No. 2 spot. There's no magic wand."

Bour's homer, a shot to left-center field, made it 3-0 in the fourth.

The Giants cut into the Miami lead on Crawford's RBI single in the bottom of the fourth, but the Marlins got that run right back in the fifth on Ozuna's second RBI single that made it 4-1.

NOTES: The Marlins arrived in San Francisco on Friday having lost or tied their previous 10 road series, going 0-5-5. ... Marlins LHP Chris O'Grady and 1B Justin Bour were college teammates at George Mason University. ... Marlins OF Ichiro Suzuki appeared in his 2,573rd game, tying him with SS Ozzie Smith for 45th place on the all-time list. ... The Giants added LF Barry Bonds to their "Wall of Fame" in a pregame ceremony attended by CF Willie Mays and 1B Willie McCovey. The seven-time National League MVP and all-time home run leader became the 49th Giant honored with a plaque on the AT&T Park wall outside the stadium. ... Giants manager Bruce Bochy announced before the game that RH Johnny Cueto will start Sunday's series finale. Cueto was scratched from his scheduled start Thursday in Detroit because of dizziness. ... The Marlins' two first-inning runs increased their season total to 69, the second-most in the majors. Miami scored four runs in the first inning of Friday's win. ...Before the game, the Giants promoted OF Mac Williamson from Triple-A Sacramento and placed LF Austin Slater (straight right groin) on the 10-day disabled list.