Novak Djokovic, Williams Sisters Team Fall In Olympics – Mondays with Bob Greene STARS Rio Olympics Juan Martin del Potro beat top-seeded Novak Djokovic 7-6 (4) 7-6 (2) Zheng Saisai beat fourth-seeded Agnieszka Radwanska 6-4 7-5 Kirsten Flipkens beat fifth-seeded Venus Williams 4-6 6-3 7-6 (5) Anna Karolina Schmiedlova beat sixth-seeded Roberta Vinci 7-5 […]