Australian Open Day 4- Tennis Now News 01/20/2011

Lauren Lynch reports the latest news from Day 4 Down Under and gives a preview for Day 5. Marcos Baghdatis showed that his fitness routine is working for him and defeated Juan Martin Del Potro. John Isner is left with Andy Roddick and Venus Williams as remaining Americans. David Nalbandian retired. Rafael Nadal, Robin Soderling, Andy Murray, Jo-Wilfried Tsonga, David Ferrer , Jurgen Melzer and Guillermo Garcia-Lopez are in and stay true to seeding. Jelena Jankovic fell out while Kim Clijsters, Samantha Stosur, Shahar Peer, Agnieska Radwanska, Flavia Pennetta, Petra Kvitova and Anastasia Pavlyuchenkova stayed in.