New Zealand skipper Kane Williamson has praised India's Virat Kohli as "the best" in the world and warned India's opponents that the superstar is "getting better." India, dubbed the "blue machine," defeated his team by 70 runs in Mumbai to advance into the ICC ODI World Cup final. India amassed 397/4, with Kohli scoring his 50th one-day international century. New Zealand, the losing finalists in the last two World Cups, were bowled out for 327. Williamson paid respect to Kohli, who broke Sachin Tendulkar's record of 49 ODI hundreds.