Starbucks Corp (SBUX.O) and Green Mountain Coffee Roasters (GMCR.O) have been in ongoing partnership negotiations, a source close to the talks told Reuters on Monday. Starbucks, the world's biggest coffee chain, wants to be a big player in the new and fast-growing single-serve coffee segment that Green Mountain currently dominates with its Keurig one-cup brewers. (Reporting by Lisa Baertlein)
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