During the Astros’ season-high six-game winning streak from May 29 to June 3, first-year manager Bo Porter said winning was contagious for a young club most counted out before the season began.

During the Astros’ current four-game winning streak, strong starting pitching has also been contagious.

Veteran lefthander Erik Bedard and righty Lucas Harrell combined for 13 strikeouts and just three earned runs during 132⁄3 innings in one-run wins Friday and Saturday against the Chicago White Sox.

Second-year starter Dallas Keuchel was equally impressive Sunday, holding Chicago to one hit and no runs during the initial five innings and guiding the Astros to a 5-4 victory at Minute Maid Park.

“When you see other guys, other starters going out there and doing their job, you want to go out there and do the same thing,” said Keuchel, who improved to 4-3 with a 4.23 ERA. “We’re just feeding off each other right now, and we’re going to hopefully continue this stretch.”

Keuchel exited after 61⁄3 innings, allowing four hits and two runs while striking out four on 92 pitches (58 strikes). He wanted to finish stronger and regretted giving up runs in the sixth and seventh.

The 25-year-old lefty relied on a two-seam fastball and changeup, while utilizing a slider against lefthanded hitters, consistently keeping the White Sox off balance.

“The starting pitching’s been tremendous,” Porter said. “You look at the stretch in which we’ve played really good baseball — I said this back in spring (training) — it starts and ends with those guys on the mound.”

Barnes shows off his golden glove

Rookie Brandon Barnes has been the Astros’ best defensive outfielder this season. The 27-year-old added to his 2013 highlight reel Sunday.

Chicago No. 5 hitter Dayan Viciedo blasted a deep shot to center field to lead off the second inning. The ball flew above Barnes’ head, initially appearing to be at least a double. But Barnes got a good initial read off the bat and sprinted at full speed up Tal’s Hill. Viciedo’s shot smoothly landed in Barnes’ glove and the center fielder tumbled headfirst up the hill, nearly ramming into the outfield wall.

How does the athletic Barnes feel about the controversial Tal’s Hill after gradually making it his own the last two seasons?

“I’m pro-hill,” said Barnes, who takes regular defensive practice near the unique outfield feature.