Tauranga runner Sam Tanner has beaten his personal best at the Millrose Games in New York, just a week after doing the same in Boston.
George Beamish also set a stunning national 3000-metre record.
In the showcase Wanamaker Mile on Sunday, Tanner trimmed 1.15 seconds from his personal best after running a patient race for a time of 3 minutes and 51.7 seconds.
The 22-year-old Athletics Tauranga athlete sat sixth or seventh for much of the race before strongly finishing over the final two laps to sprint home and claim fourth.
Nick Willis holds the New Zealand Indoor mile record of 3:51.06 recorded in New York in 2016.