Moments before she started pounding the first of her many winners past Serena Williams at the Australian Open, Ana Ivanovic listened intently to the announcer on Rod Laver Arena outlining the extraordinary accomplishments of the woman soon to be across the net from her. Williams, a five-time champion at Melbourne Park, won 78 of her 82 matches in 2013, and was coming into the fourth round on the second-longest winning streak of her career - 25 matches. ''When we were starting the match and they were talking about all her Grand Slam titles, it was quite impressive,'' Ivanovic said, recalling the pre-match introductions. ''But I didn't think much about the occasion and who I was playing, because it can get overwhelming.'' True to her word, Ivanovic, who had never won a set against Williams in four previous meetings, took on the biggest serve in women's tennis without fear. More...