Beijing — I took some time today to watch Madison Keys play. She’s practically an Iowan, born in Rock Island, Illinois. She’s currently ranked 32 on the women’s tour, is 19 years old and turned professional in 2009 — and beat Serena Williams . Today she was beaten by German Andrea Petkovic pretty handily. Keys didn’t play badly, Petkovic, ranked No. 17 and eight years older, played better.