Google Inc. recently began a same-day delivery service in the Bay Area in partnership with old-guard retailers like Staples Inc.

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As originally reported on TechCrunch and then confirmed by Reuters, the search giant is apparently working on a same-day delivery service that could pit it against the likes of Amazon Prime, eBay Now and local dispatchers like Postmates' GetItNow.

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People briefed on the project, which was two years in the making, say it was partly motivated by Amazon's success in offering two-day delivery, through its Amazon Prime, service and same-day delivery, which has been available for four years in some cities.

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WunWun is a new startup based in New York City providing same-day on-demand delivery service.

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Walmart, too, has same-day service in some markets and Google is testing same-day delivery in San Francisco, according to the Wall Street Journal.

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