[2] In 1986, Lockhart competed in 100 and 200 Breaststroke at the XIII Commonwealth Games held in Edinburgh, Scotland.
[3] In the 200 Breaststroke, he swam a time of 2:25.50 earning him 13th place behind fellow New Zealand swimmer Grant Forbes (2:24.89).
[4] In the same year, he also competed at the 1986 FINA World Swimming Championships held in Madrid.
[6] During the 200 Breaststroke, he finished 10th with a time of 2:23.46 just ahead of fellow countryman Grant Forbes (2:23.53).
[2] After a 14 year break, Lockhart continues to swim today in masters events and has competed at the past two World Masters Games (2009 and 2013) where he claimed six gold medals in the pool.