AC Nielsen group managing director Eleni Nicholas said: 'Asda traditionally do well over holiday periods, such as Christmas and Easter, and we expected an improvement in their performance this month.'
TNS figures released later today are expected to back AC Nielsen's results, also putting Asda at number two.
Tesco is still outperforming the rest of the sector, with a market share of 29.1 per cent - an increase of 5 per cent year-on-year.
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