By Jana Weigand

LONDON--Asda Stores Ltd., the British arm of Wal-Mart Stores Inc. (WMT), Thursday reported a 0.1% rise in like for like sales in the 15 weeks to April 20, helped by strong Easter trading, and said it is narrowing the price gap to discounters such as Aldi.

The supermarket chain, which outlined its five-year strategy in November, said it continues to invest in driving efficiency in what it called a challenging market. "We are in the first few months of a five year journey, but I am confident that we are on the right path," Chief Executive and President Andy Clarke said.

Rival supermarket chain Wm Morrison Supermarkets PLC (MRW.LN) last week reported a 4.2% drop in first-quarter sales and said the trading environment remains challenging.

The U.K.'s "big four" supermarket chains--Asda, Tesco Corp. (TESO), J Sainsbury PLC (SBRY.LN) and Wm Morrison--are losing customers to high-end grocer Waitrose and discount chains such as Aldi and Lidl, which are rapidly expanding and benefiting from an improving customer perception of quality.

Write to Jana Weigand at jana.weigand@wsj.com

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