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Jordan Spieth's caddie, Michael Greller, surrendered the bag after 11 holes and was treated for heat-related symptoms Saturday at Colonial.
Webb Simpson leads by two at Colonial and will enter Sunday looking to end a four-year PGA Tour winless drought.
Hours after winning The Players Championship, Si Woo Kim withdrew from the AT&T Byron Nelson citing the back injury that led to four other withdrawals earlier this season.
Four times this season Players champion Si Woo Kim has been forced to withdraw from a PGA Tour event with a back injury, most recently last month at the Shell Houston Open .
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