Coach Ivan Lendl stated that great champions such as Rafael Nadal and Andy Murray can never be underestimated as all of them share one thing in commong – an incredible determination. Nadal, 35, admitted his foot problem got so bad that there was period when he wasn’t even sure whether he would be able to play in Australia. In the end, Nadal made the decision to travel to Australia and the rest is history. In Australia, Nadal went 11-0 as he claimed back-to-back titles at the Melbourne Summer Set and Australian Open. Lendl, who recently reunited with Murray, was asked if Murray could get back to competing for the biggest titles. “You are asking this with a straight face after what Rafa [Nadal] has done …