Jankovic and Tamira Paszek split the first two sets -- each winning 6-2 -- but the third set turned epic and lasted nearly two hours. Paszek served at 7-6 in the third set but Jankovic broke her serve. She eventually took the set at 12-10.
Henin had no trouble dispatching Aiko Nakamura 6-2, 6-2, using seven aces in running her personal match winning streak to 29. Williams, seeded seventh, needed just 62 minutes to finish off Jarmila Gajdosova 6-3, 6-3.
Also Monday, fifth-seeded Maria Sharapova, who lost to Williams in last year's Australian Open final, swept Kostanic Tosic 6-4, 6-3. Lindsay Davenport, who missed last year's tournament due to pregnancy, ran her record to 19-1 since returning to play with a 6-2, 3-6, 7-5 win over Sara Errani. Sharapova and Davenport are paired against each other in the second round.
No. 11-seeded Elena Dementieva stopped Tzipora Obziler 6-2, 6-2; 13th-seeded Tatiana Golovin beat Stephania Cohen-Aloro 6-1, 4-6, 6-3; 15th-seeded Patty Schnyder defeated Lilia Osterloh 6-3, 6-3 and No. 17-seeded Shahar Peer beat Renata Voracova 6-2, 2-6, 6-0. Also Amelie Mauresmo, won who the Australian Open in 2006 posted a 6-7 (6-8), 6-0, 6-0 win over Tatiana Poutchek.
Celebrity Couples of 2014 [PHOTOS]