CINCINNATI (AP) — Maybe it’s the way the ball flies out of the park. Perhaps it’s the humid climate that reminds them of home. Or, it might just be the confidence of knowing that every time they show up, something good seems to happen.

Whatever the reason, the Houston Astros sure love it in Cincinnati.

Wandy Rodriguez allowed one run in seven innings and Ivan Rodriguez homered and doubled Tuesday night, helping the Astros extend their three-year winning streak at Great American Ball Park with an 8-3 victory over the Cincinnati Reds.

The Astros have won their last 11 games in Cincinnati, a streak that started late in the 2007 season and is the longest current run of dominance in the majors. Houston is 32-15-1 at the hitter-friendly ballpark that opened in 2003.

It’s not only their hitters who like it.

‘‘Every time we play here, we play great,’’ Wandy Rodriguez said.

Rodriguez (2-2) leads a staff that has prospered at Great American, going 3-0 in his career at the ballpark. Houston’s three starters in the series — Roy Oswalt, Rodriguez and Felipe Paulino — are a combined 11-1 at Great American.

Ivan Rodriguez homered off Aaron Harang (2-3), who lasted only five innings against a lineup that sprouts a little swagger whenever it hits town.

‘‘They like to come in here and hit,’’ Reds manager Dusty Baker said. ‘‘They were commenting around the batting cage about how they feel comfortable and confident playing here.’’

The Reds made three errors behind Harang, letting in two runs. When Harang finished Houston’s four-run fifth inning, he slowly walked to the dugout with his head down and threw his black glove against the back wall, knocking a red jacket onto the floor.

It’s been a frustrating month for Harang, who lost 17 games last season and has alternated losses and wins in his five April starts.

Reds’ boxscore

Astros 8, Reds 3

Houston Cincinnati

ab r h bi ab r h bi

KMatsu 2b 5 2 3 2 Tavers cf 3 1 0 0

Bourn cf 3 1 0 0 HrstnJr 3b 4 0 2 0

Brkmn 1b 4 0 0 0 Votto 1b 3 0 0 0

Ca.Lee lf 5 0 1 2 Phillips 2b 4 1 2 1

Tejada ss 5 1 1 0 Bruce rf 3 0 0 0

Pence rf 4 0 0 0 RHrndz c 4 0 1 0

Blum 3b 4 1 2 0 DMcDn lf 4 0 1 0

IRdrgz c 3 3 2 1 AlGnzlz ss 4 0 0 0

WRdrg p 2 0 0 0 Harang p 1 0 0 0

Erstad ph 1 0 1 1 Owings ph 1 0 0 0

Geary p 0 0 0 0 Masset p 0 0 0 0

Wrght p 0 0 0 0 Lincoln p 0 0 0 0

Nix ph 1 1 1 1

Burton p 0 0 0 0

Totals 36 8 10 6 Totals 32 3 7 2

Houston 110 040 020 — 8

Cincinnati 100 000 011 — 3

E—D.McDonald (2), Votto 2 (3). DP—Houston 1, Cincinnati 1. LOB—Houston 6, Cincinnati 5. 2B—Ca.Lee (5), Tejada (5), I.Rodriguez (3), Hairston Jr. (1), Phillips (3). HR—I.Rodriguez (3), Phillips (2), Nix (1). SB—K.Matsui 2 (4), Bourn 2 (6), Phillips (4). S—W.Rodriguez.

IP H R ER BB SO

Houston

W.Rodriguez W,2-2 7 5 1 1 2 5

Geary 1 1 1 1 0 0

W.Wright 1 1 1 1 1 0

Cincinnati

Harang L,2-3 5 6 6 5 1 2

Masset 2 1 0 0 2 0

Lincoln 1 3 2 2 1 2

Burton 1 0 0 0 0 0

WP—W.Rodriguez. Umpires—Home, Fieldin Culbreth; First, Kevin Causey; Second, Jim Wolf; Third, Brian O’Nora. T—2:46. A—9,878 (42,319).