* North American weakness drags on surprise Q3 growth
* New boss Dave Lewis promises fixes are underway
* Shares up on Q3 sales beat thanks to Guinness demand, World Cup (Rewrites to focus on North America; adds shares in paragraph 3; analyst quote in 11-12)
May 6 (Reuters) - Diageo beat third-quarter sales expectations on Wednesday, but continued weakness in North America underscored the scale of the challenge facing new CEO Dave Lewis.
The world's largest spirits maker posted 0.3% organic growth in net sales, confounding forecasts for a 2.3% drop, helped by strong Guinness demand in Britain and Ireland and stocking up ahead of the soccer World Cup in Latin America and the Caribbean.
The surprise beat gives Lewis an early boost. Shares in the Johnny Walker whisky maker rose more than 6% in early trade.
But performance in the United States, Diageo's biggest market, remained a drag, with North American sales down a further 9.4%.
"North America remains our biggest challenge, where market conditions are soft and our offer needs to be more competitive. Actions are already underway to address this," Lewis, who took over in January, said in a statement. He gave no details.
LEWIS TO LAY OUT STRATEGY IN AUGUST
Lewis' appointment has raised hopes of a turnaround after years of flat or falling sales and mounting investor frustration under predecessor Debra Crew.
Nicknamed "Drastic Dave" for aggressive cost-cutting at Tesco and Unilever, Lewis has moved quickly at Diageo, cutting its sales forecast and halving the interim dividend in February.
He said on Wednesday he remained on track to set out a full strategy in August.
Diageo's third-quarter performance lends some support to Lewis's claim that steps are being taken to address North America, RBC Capital analyst James Edwardes Jones said in a note.
However, he added: "Given the importance of the U.S. to Diageo, it would be flippant to argue that things are on the mend yet."
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