Michael Phelps knows a thing or two about making history in his sport. So with Jordan Spieth seeking the career grand slam this week, it's not surprising Phelps is at Quail Hollow providing support for his friend.
Phelps was seen inside the ropes following the Spieth, Sergio Garcia, and Brooks Koepka group Thursday at the PGA Championship.
Both Spieth and Phelps are sponsored by Under Armour, but they also recently hung out together in Cabo with a group of other big-name athletes.
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