SNOQUALMIE, Wash. --
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Couples, from Seattle, has a long history of back issues and took three weeks off before the tournament.
After his drive on No. 1 at the TPC Snoqualmie Ridge, Couples lagged behind partners Mark O'Meara and
"I didn't feel very good warming up," Couples said. "I hit the tee shot at No. 1 and then my lower back really locked up when I walked down to my second shot.
"It was like a bomb went off in my lower back. I think it's time to rest. I'm sad I won't be able to play in this year's event. For this to happen in Seattle, this is a rough one."
The 1992 Masters champion won the Mississippi Gulf Resort Classic in March and Senior British Open last month.