Tom Latham kept a cool head today at a time he might have felt entitled to feel high agitation.
On 97, the lefthand opener swept a ball from spin bowler Rangana Herath for two. Sri Lanka had appealed for lbw and, when it was rejected, referred it upstairs.
The wait took an age as third official Paul Reiffel studied the screen. Eventually he backed the original decision, as he did not have all the available technology. A DRS flaw, but the right decision was reached, even if in an unorthodox manner.
Latham duly completed his third test century, and first at home as he pushed New Zealand into a strong position and advanced a declaration.
''I was pretty certain I hit it so I wasn't too bad," he said.