CINCINNATI (AP) — Jason Marquis lasted only three innings. One of the home run smokestacks caught fire and burned away for an inning until the fire department sprayed it out.

Nothing went right for Cincinnati.

Brandon Belt hit a three-run homer, and Buster Posey added a two-run shot off Marquis on Friday night, leading the San Francisco Giants to a 10-2 victory over the Reds in a game played uninterrupted while an outfield smokestack burned for an inning.

“I’ve seen some weird things like all the lights going off, but I’ve never seen smokestacks on fire,” manager Bryan Price said.

One of the two riverboat smokestacks that shoot off celebratory flames and fireworks caught fire in the top of the sixth because of a malfunctioning propane valve. Flames shot from the top of the smokestack for an inning, spewing dark smoke, until firefighters extended a ladder from outside the ballpark and sprayed it.

Fans in two outfield sections by the smokestacks were evacuated while the fire was extinguished.

“Those guys did a great job,” Reds center fielder Billy Hamilton said. “I didn’t want to be out there anywhere near it. I tried to get away from it as quick as I could.”

San Francisco’s struggling offense piled up a season high in runs. Belt and Posey homered off Marquis (3-3), who lasted a season-low three innings while allowing a season-high six runs. Belt also had an RBI double among his three hits and scored three times.

“I’m just not very good right now,” Marquis said. “I can’t throw pitches consistently like I want to. I’d better figure something out quick. This is not fun.”

Left-hander Madison Bumgarner (4-2) gave up eight hits in seven innings, including solo homers by Zack Cozart and Billy Hamilton. After getting off to a slow start this season, the World Series MVP has gone 3-1 with a 2.14 ERA in his last five starts.

The teams have split the first two games in their series. San Francisco won at Great American for only the fourth time in its last 16 regular-season games.

One of the NL’s worst offenses hopes to get a boost when outfielder Hunter Pence rejoins the Giants on Saturday. Pence’s left forearm was broken by a pitch from the Cubs’ Corey Black on March 5. He went 5 for 17 with two homers in five games on a rehab assignment with Triple-A Sacramento.

The Giants’ Joe Panik extended his hitting streak to a career-high 11 games with a single in the first inning. Belt’s first homer of the season made it 3-0.

Posey connected in the third, the ninth homer allowed by Marquis, the most on the Reds’ staff.

BAD ONES BACK-TO-BACK

In his last two starts, Marquis has given up 11 runs, 17 hits and five homers in 8 2/3 innings.

MATTHEUS’ DEBUT

Reliever Ryan Mattheus, acquired by the Reds off waivers from the Angels this week, made his Cincinnati debut and gave up two hits and a run in one inning.

TRAINER’S ROOM

Giants: RHP Matt Cain threw 30 fastballs in the bullpen without problem. He’s expected to throw again on Tuesday. Cain has been sidelined by a strained tendon in his pitching forearm.

Reds: 2B Brandon Phillips was back in the starting lineup after missing two games with a sprained left big toe. He got an insert for the shoe to help protect the toe and moved carefully in the field.

UP NEXT

Giants: Ryan Vogelsong is 2-0 with a 4.18 ERA at Great American Ball Park in three starts and four relief appearances.

Reds: Mike Leake is 5-1 in seven career starts against the Giants with a 3.83 ERA.

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Follow Joe Kay on Twitter: http://twitter.com/apjoekay

FRIDAY’S GAME
Giants 10, Reds 2
San Francisco    AB    R    H    BI    BB    SO    Avg.
G.Blanco lf-cf    4    1    2    0    1    1    .257
Panik 2b    4    1    2    0    1    1    .292
Pagan cf    5    2    0    1    0    1    .324
H.Sanchez c    0    0    0    0    0    0    .194
Posey c    5    1    1    2    0    0    .286
Y.Petit p    0    0    0    0    0    0    .000
Belt 1b    5    3    3    4    0    0    .291
Maxwell rf    4    1    1    1    1    1    .250
B.Crawford ss    4    0    2    1    0    0    .263
d-Arias ph-ss    1    0    0    0    0    0    .231
McGehee 3b    3    0    1    1    1    0    .191
Bumgarner p    3    0    0    0    0    1    .059
c-Aoki ph-lf    1    1    1    0    0    0    .279
Totals    39    10    13    10    4    5

Cincinnati    AB    R    H    BI    BB    SO    Avg.
B.Hamilton cf    5    1    2    1    0    1    .212
Cozart ss    4    1    1    1    0    0    .319
Votto 1b    4    0    2    0    0    1    .305
Hoover p    0    0    0    0    0    0    —
Frazier 3b    4    0    2    0    0    0    .250
Byrd lf    3    0    1    0    0    1    .229
Boesch rf    1    0    0    0    0    0    .154
Phillips 2b    4    0    0    0    0    0    .301
B.Pena c-1b    3    0    0    0    0    0    .341
e-Schumaker ph    1    0    0    0    0    0    .194
Negron rf-lf    4    0    1    0    0    1    .120
Marquis p    1    0    0    0    0    1    .143
Badenhop p    0    0    0    0    0    0    —
a-Lorenzen ph-p    1    0    0    0    0    0    .167
b-Mesoraco ph    1    0    0    0    0    0    .135
Mattheus p    0    0    0    0    0    0    —
Barnhart c    1    0    1    0    0    0    .304
Totals                       37           2         10        2            0       5

San Francisco        303    000    310    —    10    13    0
Cincinnati        100    010    000    —    2    10    1

a-grounded out for Badenhop in the 5th. b-popped out for Lorenzen in the 7th. c-singled for Bumgarner in the 8th. d-grounded out for B.Crawford in the 9th. e-flied out for B.Pena in the 9th.
E—Negron (3). LOB—San Francisco 6, Cincinnati 8. 2B—G.Blanco (7), Belt (9), Maxwell (4), Frazier (6), Byrd (4). HR—Belt (1), off Marquis; Posey (6), off Marquis; Cozart (6), off Bumgarner; B.Hamilton (3), off Bumgarner. RBIs—Pagan (10), Posey 2 (17), Belt 4 (11), Maxwell (16), B.Crawford (18), McGehee (8), B.Hamilton (6), Cozart (17). SB—G.Blanco (2), B.Crawford (2).
Runners left in scoring position—San Francisco 5 (G.Blanco, Bumgarner 2, Posey 2); Cincinnati 4 (Byrd, B.Pena 2, Cozart). RISP—San Francisco 4 for 15; Cincinnati 0 for 4.
Runners moved up—Pagan, Posey. GIDP—Bumgarner.
DP—Cincinnati 1 (Lorenzen, Cozart, Votto).

San Francisco    IP    H    R    ER    BB    SO    NP    ERA
Bumgarner W, 4-2    7    8    2    2    0    4    104    3.20
Y.Petit    2    2    0    0    0    1    25    3.32
Cincinnati    IP    H    R    ER    BB    SO    NP    ERA
Marquis L, 3-3    3    7    6    6    2    4    64    6.63
Badenhop    2    1    0    0    0    0    21    9.26
Lorenzen    2    3    3    3    2    0    44    4.00
Mattheus    1    2    1    1    0    1    20    9.00
Hoover    1    0    0    0    0    0    5    3.00
Umpires—Home, Dan Bellino; First, Bruce Dreckman; Second, Tom Hallion; Third, Alfonso Marquez.
T    —2:53. A—39,867 (42,319).