Fans also cheered beloved veteran Todd Helton after he legged out a first inning double.
The Gunners captain quickly passed to Hleb, who drilled a low shot past Helton.
Having failed to beat Helton with an array of shots, Arsenal went ahead with a header.
CNN's Jim Acosta, John Helton, Gabriella Schwarz and Gregory Wallace contributed to this report.
CNN's Marlena Baldacci, Kevin Bohn, John Helton and Kevin Liptak contributed to this report.
Michael Cuddyer and Todd Helton followed with hard singles to put runners at the corners for rookie Nolan Arenado.
Helton's double was the 573rd of his career, moving him past Ivan Rodriguez for 20th on baseball's all-time list.
Helton's double was the 573rd of his career, moving him past Ivan Rodriguez for 20th on baseball's career list.
Wainwright and Miller retired 40 consecutive batters with 18 strikeouts before Helton walked.
Undeterred by that miss, Van Persie tried his luck with another low shot that Helton again did well to parry.
Helton thought Boesch was out and began heading to the dugout, but first base umpire Phil Cuzzi ruled him safe.
That's not to say this study is necessarily indicative of whether Helton or any of the high earners are overpaid.
Lurking in that space was Henry, who got the better of his marker Pepe to direct a header past the static Helton.
He snatched the ball and slid his penalty past Helton to provide the perfect finale to a wonderful night for Wenger's side.
When he went to Baghdad, he went with his colleague Arthur Helton.
As early as the third minute Porto's goalkeeper Helton was scrambling across his line to get down a low left-footed Van Persie shot.
First baseman Todd Helton thought Boesch was out and began heading to the dugout, but first base umpire Phil Cuzzi ruled him safe.
Colorado got a two-run single from Wilin Rosario, a two-run double from Todd Helton and RBI singles from Chris Nelson and pinch-hitter Reid Brignac.
"Felt like he was out, " Rockies first baseman Todd Helton said.
Kuroda's wild pitch sent Helton to second but Cuddyer had to hold up when the ball caromed off the backstop and back to catcher Chris Stewart.
Nasri's pass sent Arshavin through, and when Nuno Coelho collided with Helton as he challenged the Russian, Bendtner was lurking to steer home the loose ball.
Todd Helton, the game's best hitter overall, shows his worth.
United were trailing to Cristian Rodriguez's fourth-minute opener -- and lucky not to be further adrift -- when Bruno Alves turned a pass back towards goalkeeper Helton without looking.
Just before the half-time whistle, Helton was troubled by another header, this time from Van Persie, but the Porto keeper did well to keep the ball out of the net.
In the fifth, Stewart reached third, but he, too, was stranded, when first baseman Todd Helton scooped the throw from third baseman Arenado to nab Suzuki for the third out.
Van Persie was less convincing on his other foot, blasting the ball over the bar with just Helton to beat after Henry slipped a delightful pass to the former Feyenoord forward.
Substitute Emmanuel Eboue quickly added the fourth as Arsenal launched a sweeping counter-attack from a Porto corner, Arshavin again making life easy for his team-mate to go around Helton and score.
Arshavin's header had already brought a fine save from Helton at his near post before Bendtner put his wayward weekend finishing behind him to give Arsenal the lead after 10 minutes.
Eric Young led off Friday night's game with a broken-bat single off Miller then failed to put a runner on until Todd Helton walked with one out in the fifth inning a day later.
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