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Indianapolis 500

NASCAR's Tony Stewart will retire from Cup racing after '16

There was no final straw, no outside influence, no personal trauma that led Tony Stewart to set an expiration date on his NASCAR career. Instead, the three-time NASCAR champion simply decided enough was enough. "I think deep down you know when it's time to do something to make a change," Stewart said Wednesday in announcing he will retire from Sprint Cup racing following the 2016 season to wrap up a storied 18-year career in NASCAR's top tier. If there was any doubt Stewart was at peace with his decision, he proved otherwise with a wide smile and his usual self-deprecating humor during a news conference that lasted nearly an hour at Stewart-Haas Racing. He called...