The numbers aren't in yet, but Walmart might have overtaken Amazon as the largest digital grocery player in the US.

That would be an impressive feat, because in 2017, Amazon accounted for 12.5% of US digital grocery sales, compared with Walmart's 11.1%, according to a Deutsche Bank Securities report.

What's more, Deutsche reports that Walmart will account for an estimated 17% of sales by 2025.

More evidence that Walmart could surpass Amazon comes from a September survey by The Retail Feedback Group, which showed that 33% of US digital grocery shoppers made their most recent purchase on Walmart's site, while 31% chose Amazon. 

Walmart's rise in digital grocery sales is due partly to its investments in curbside pickup, which is currently available in more than 2,000 stores. Amazon also has curbside pickup options at Whole Foods locations in 22 US cities, but it's available only to Prime members.

Curbside pickup and other click-and-collect models make sense for groceries because shoppers have a chance to review orders for quality and freshness before completing a transaction. Concerns over not receiving the highest-quality items have been a barrier to digital grocery adoption in general.

Speaking about digital grocery buyers in France, Mudit Jaju, global head of ecommerce at Wavemaker, said curbside pickup also allows shoppers to "pick up their orders at their own leisure" and "not be locked into a 2-hour delivery window."

Thanks mainly to a service called Drive, click-and-collect is the primary fulfillment method for digital grocery orders in France.

In the US, it's also picking up speed. According to Market Force Information, 14.9% of US grocery buyers had bought groceries online and picked up in-store as of June 2018, up more than 10 percentage points from 2016.

And it's likely that the share will continue to rise as more US grocers adopt click-and-collect services. Progressive Grocer found that 31.8% of US grocery stores offered a click-and-collect option in 2018, up from 22.5% in 2017.

More on Digital Groceries from eMarketer

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