Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) -- The Australian Open provides a testing challenge for the world's top tennis players as they turn out for the first grand slam tournament of the season. The searing heat of the Melbourne summer sun, the high bounce of the blue Plexicushion hard-court playing surface and the boisterous atmosphere generated by the packed stands all blend together to make the January 14-29 event an unforgettable experience. It may not yet have prestige of the other three majors, but it is a place where stars are born and where legendary reputations are no guarantee of success -- and the rewards have grown greater and greater.The first grand slam of the tennis season, the Australian Open, takes place in MelbourneNovak Djokovic and Kim Clijsters will be defending their men's and women's singles titlesIn 1976, Mark Edmondson, world ranked 212th, claimed a shock victory in the tournamentMartina Hingis became the youngest grand slam winner when she triumphed in 1997 
 Question:Once _ was confirmed as the definitive home for the tournament, it soon became apparent that a new site needed to be constructed to accommodate the vast numbers of fans wanting to watch the action.

Melbourne