"Radek helped me to get to be the oldest man to ever win a grand slam in the Open era. I thank him for that, and we are definitely not done. I'm going after 41 now, 42, and then 43."
Serena Williams triumphs in U.S. Open
Williams, 31, becomes oldest winner of tournament
POSTED: 05:54 PM PDT Sep 08, 2013 UPDATED: 07:02 AM PDT Sep 09, 2013
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