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What's the first thing you do after winning the Players Championship and the accompanying $1.89 million prize? If you're Si Woo Kim, you apparently hop on a flight in the middle seat in coach and jet off to Atlanta.

Kim also pulled out of the AT&T Byron Nelson with back issues. Swing coach Sean Foley called it "precautionary." It's a problem that has hampered him throughout his young career and caused four withdrawals so far this season. 

Foley noted earlier this year that part of his back problems were because of his swing, which Foley has since tried to correct. Not exactly terrific news if you're a 21-year-old, although it's clear that Kim has the talent to be great if he can keep himself healthy.

Flying coach won't help it either.