Playing the World Test Championship (WTC) final against Australia within one week of the IPL's conclusion is going to be a huge challenge, India head coach Rahul Dravid said on Monday. Virat Kohli slammed his first Test century in more than three years, after Shubman Gill's sparkling 128, as India responded strongly to Australia's stiff first innings total of 480 to draw the fourth and final Test and clinch the Border-Gavaskar series 2-1 here. Just before the post-lunch session on the final day, news trickled in that Kane Williamson's magnificent hundred sealed New Zealand's thrilling two-wicket win over Sri Lanka in Christchurch, paving the way for India's march to their second successive WTC final.