But many times he doesn't respond because he doesn't know the answer yet, or he knows the answer will disappoint her.

WSJ: Nagging in Marriage Is More Common Than Adultery But Can Also Lead to Divorce

But when the 11-time Grand Slam champion heads to the hard courts for an official match later this week at Indian Wells, he doesn't know how his balky knee will respond.

WSJ: Rafael Nadal ready to test knee on hard courts

Woods doesn't answer, which may suggest he will respond in a subsequent ad.

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