The first goal of Paul Green's international career and the 42nd and 43rd of Robbie Keane's handed Ireland a deserved victory over Algeria.
The World Cup finalists never looked like recovering from Green's 32nd-minute header on his first start for Ireland, and Keane's strike seven minutes after the break was little more than Giovanni Trapattoni's men deserved.
Keane, who had earlier forced two fine saves and hit a post, completed the job when he converted an 85th-minute penalty after being tripped by defender Djamel Mesbah.
Trappatoni's side might have been ahead as early as the third minute when Kevin Doyle got across his marker to meet Damien Duff's free-kick with a steered volley, although he was only able to guide the ball into the waiting arms of goalkeeper Faouzi Caouchi.
Green did not look out of place and made one vital interception inside his own box to cut out a Yazid Mansouri cross, but his evening was to get even better. He bravely dived in to meet Liam Lawrence's 32nd-minute free-kick in front of Caouchi and open the scoring, although he took a boot in the head from the goalkeeper in the process.
Ireland might have increased their lead within four minutes of the restart had debutant Djamel Mesbah not got in a fine block to deny Lawrence.
However, Algeria contributed to their own downfall three minutes later when, after Wolves defender Aldane Guedioura had allowed Damien Duff to cross from the left, Caouchi punched the ball ineffectually towards Keane, who hooked it back over him and into the empty net.
Irish stopper Keiren Westwood was called upon for the first time to keep out Karim Ziani's long-range effort with 55 minutes gone, but Ireland were dominating in possession and chances.
Three times inside seven minutes Keane could have added to his tally, first forcing a good diving save from Caouchi before being denied by the post after running onto Kevin Doyle's flick. He then only just failed to beat substitute goalkeeper Rais Mbolhi with a cheeky 70th-minute lob.
Guedioura came close to pulling one back for the visitors when he rattled the crossbar with a late header, but Mesbah was adjudged to have tripped Keane when he played the ball first and the Tottenham striker stroked home the 43rd goal of his international career from the spot.
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