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HIGHLIGHTS-Tennis-Day four at the Australian Open

(Corrects Djokovic score second paragraph to make clear there was no tiebreak in fifth set) MELBOURNE, Jan 19 (Reuters) - Latest news from the fourth day of the Australian Open tennis championships on Thursday (all times GMT): 0918 Lucic-Baroni upsets Radwanska to progress Croatia's Mirjana Lucic-Baroni made quick work of Agnieszka Radwanska, beating the Polish third seed 6-3 6-2 in an hour and two minutes. 0845 DJOKOVIC PLAYS DOWN SURPRISE LOSS TO ISTAMIN "I don't think it was physical. We both looked okay. After four-and-a-half hours, we didn't seem to be tired. Of course, four-and-a-half hours is not easy on the body," Novak Djokovic said after his 7-6(8) 5-7 2-6 7-6(5) 6-4 loss to Uzbek Denis Istomin. "But still, I don't think that has affected neither me or my opponent. It was just in the game of tennis, you know, one guy beats the other guy. That's all I can say." READ MORE Radwanska dumped out of Australian Open second round Djokovic blames bad day at office for Istomin shocker Match stats: Istomin v Djokovic at Australian Open Defending champion Djokovic knocked out of Australian Open Konta hones mental mettle to down Osaka Blink and it's over as Pliskova warns rivals Raonic races into third round 'Nick off!' - Australian media slam Kyrgios Murray moving well after ankle injury scare 'Ask Johnny Mac' - Kyrgios hits back at McEnroe 0820 DEFENDING CHAMPION DJOKOVIC KNOCKED OUT BY ISTOMIN Uzbekistan's Denis Istomin causes a massive upset as he beats defending champion and second seed Novak Djokovic in four hours and 48 minutes. Istomin faces Spanish 30th seed Pablo Carreno Busta in the next round. 0745 ROARING RAONIC LOOKS AT THE SMALL DETAILS "In general over the last probably three-four tournaments, I've tried always to be a bit more positive and vocal with myself. I don't know how much of that I had in me," he said after his win over Luxembourg's Gilles Muller. "I just try to do these little things to get a better level of tennis out of myself." 0726 KARLOVIC COMFORTABLY THROUGH TO THIRD ROUND Big-serving Croatian Ivo Karlovic secures a routine 6-4 6-4 6-4 win over Australia's Andrew Whittington to advance to the third round, where he will face Belgium's 11th seed David Goffin. 0658 MONFILS FIGHTS OFF DOLGOPOLOV TO ADVANCE Sixth seed Gael Monfils overcame stiff resistance from Alexandr Dolgopolov before sealing a 6-3 6-4 1-6 6-0 victory against the Ukrainian in an hour and 56 minutes. The flamboyant Frenchman advances to face German 32nd seed Philipp Kohlschreiber in the next round. 0634 GOFFIN STORMS THROUGH TO THIRD ROUND Belgium's 11th seed David Goffin has no problems against a sloppy Radek Stepanek, who committed 44 unforced errors, beating the 38-year-old Czech 6-4 6-0 6-3 in an hour and 44 minutes. 0545 RAONIC BEATS MULLER, FACES SIMON IN THIRD ROUND Canadian third seed Milos Raonic, with 21 aces and 56 winners, beats Luxembourg's Gilles Muller, beating the 33-year-old 6-3 6-4 7-6(4) in two hours. The big-serving Raonic faces French 25th seed Gilles Simon in the next round. 0520 FERRER REACHES THIRD ROUND David Ferrer rallies from a set down to beat American Ernesto Escobedo 2-6 6-4 6-4 6-2 in two hours and 46 minutes. The Spanish 21st seed faces compatriot Roberto Bautista Agut in the next round. 0449 WOZNIACKI THANKS PHYSIO FOR STRONG START "I have a full-time physio with me all the time, which has really helped me. I get treatment every day," former world number one Caroline Wozniacki said after beating Donna Vekic 6-1 6-3 in the second round. "Just to keep on top of my body and help me recover, and it's really helped me a lot. I think that's actually the main thing for me right now is to make sure that my body is fit and healthy, because when it is... I give myself the best chance to win." ORDER OF PLAY (prefix denotes seeding) ROD LAVER ARENA 17-Caroline Wozniacki (Denmark) v Donna Vekic (Croatia) Denis Istomin (Uzbekistan) v 2-Novak Djokovic (Serbia) Not before 0800 GMT: Lucie Safarova (Czech Republic) v 2-Serena Williams (U.S.) Marcos Baghdatis (Cyprus) v 9-Rafa Nadal (Spain) MARGARET COURT ARENA 6-Dominika Cibulkova (Slovakia) v Hsieh Su-Wei (Taiwan) Gilles Muller (Luxembourg) v 3-Milos Raonic (Canada) Not before 0800 GMT: Mirjana Lucic-Baroni (Croatia) v 3-Agnieszka Radwanska (Poland) 8-Dominic Thiem (Austria) v Jordan Thompson (Australia) HISENSE ARENA 15-Grigor Dimitrov (Bulgaria) v Chung Hyeon (South Korea) Not before 0430 GMT: 6-Gael Monfils (France) v Alexandr Dolgopolov (Ukraine) Not before 0730 GMT: 22-Daria Gavrilova (Australia) v Ana Konjuh (Croatia) (Editing by Sudipto Ganguly)