On February 6, just eight days after setting a new personal best, Tanner recorded a new personal best at the New Balance Indoor Grand Prix in Boston to become the third-faster miler in New Zealand history.
Race winner Yared Nuguse won on Sunday in a dazzling time of 3:47.38, and in the process set a Wanamaker Mile and United States national record.
The Wanamaker Mile has been taking place for nearly a century.
It was named in honour of Rodman Wanamaker, owner of the Wanamaker department store.
Employees of its New York branch organised the first Millrose Games in 1908 and in the early days, the signature race was 1.5 miles (2.4km) before being shortened to 1 mile (1.6km) in 1926.
Meanwhile, Beamish, 26, finished sixth in the 3000m with a time of 7:36.22 to take 3.28 seconds from the indoor New Zealand record that he set at the same meeting last year.
It was also quicker than Willis’ national outdoor record of 7:36.91, set in 2014, to ensure Beamish banked the absolute New Zealand 3000m record.