Two days from the start of the first test, Australia's captain Steven Smith has given his New Zealand rival Brendon McCullum a verbal slap and promised no holding back on sledging their opponents in the series.
Smith, ahead of what will be his first series since taking over from Michael Clarke, was reacting to criticism by McCullum over an incident during Australia's tour of England this year.
Smith's failure to withdraw an appeal after England player Ben Stokes was given out obstructing the stumps from an attempted run out while taking evasive action, drew a sharp opinion from McCullum.
"We've all done things on the field that we regret later, I know I certainly have," McCullum wrote in a column in Britain's Daily Mail newspaper.
"But it was disappointing that Smith had a chance to make a statement about the way he wants his side to play the game and chose to go the other way.