Despite a pesky 1.4m-per-sec headwind, Wyatt clocked a personal-best 10.68sec time in front of a large Caledonian Ground crowd to scoop the title.
While the field was missing a few of the country's top sprinters, including Tauranga's Joseph Millar, who is in Australia for the Melbourne World Challenge, Wyatt would have pushed them, judging by yesterday's form.
His winning time was 0.04sec faster than his previous best, set in Hamilton last month.
Wyatt said it ‘‘was just awesome'' to win the national title in a personal-best time, but was quick to switch his focus to winning back the senior men's long jump title he lost in Wellington a year ago.
Scott Walker, of Canterbury, was second in 10.85sec, while Alex Jordan won bronze in 10.89sec.
Otago's Daniel O'Shea, who recorded the third-fastest time in the morning's heats, was quick out of the block but finished fifth in 10.93sec.
Fellow Otago runner Cory Innes, who finished third in his heat, was eighth in 11.11sec.
The senior women's final was also won by an Aucklander, with Rochelle Coster finally winning her first national title. She had had to settle for a string of silver and bronze medals in the event since 2010, but ended her drought with an impressive personal-best time of 11.64sec.
Her previous best was 11.72sec, set in Canterbury last February. Aucklander Hamish Gill showed he is one to watch in the future, winning the men's under-20 100m final in 10.82sec.
He had to contend with a 1.9sec-per-metre headwind, and edged Wellington's Jacob Matson, who was second in 10.96sec. The 100m finals attracted a healthy crowd, with the grandstand almost full and the length of the track also lined with spectators.
The national track and field championships continue with the men's under-18 hammer throw at 9am today and wrap up with the senior men's triple jump at 3pm tomorrow.
