On McCullum’s recent purple patch with the bat, McMillan asserted that it was the Black Caps captain’s tight defence that has paved the way for his success even though he has been bludgeoning bowling attacks. "One of the keys to his performance in Test match cricket over the last 12-18 months is the work he's done on his defence. That might sound a little bit crazy when he's belting the ball around the park as he has, but I think he's tightened up in certain areas of his game, and kept the good balls out," McMillan said."When he gets any chance to score - and for McCullum the margins are so small for the bowlers - he really punishes you and makes you pay. We know he plays all around the wicket and has all the shots, but his option-taking, based around a sound defence, has taken his game to another level."