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Lester's record was fairly unspectacular, though his knockout ratio in winning bouts was fairly high. His first manager was Harry Burns, but in 1910, ex-boxing champion Tommy Burns took Lester on. Tommy Burns sent Lester to Australia in 1911 to gain fight experience, and in September that year he beat Bill Lang, the Australian heavyweight champion, by points. While in Australia Lester and Burns's relationship became strained and Lester dropped Burns for Hugh MacIntosh. Lester spent the entirety of 1912 in Australia, but by March 1913 Lester was back in the States and fighting in California. Towards the end of his career he lost two matches to Light Heavyweight champion Jack Dillon.
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References
^"Jack Lester". Boxrec. Retrieved 2010-10-15. A profile in the April 16, 1929 Ironwood Daily Globe reported that Lester had died at the age of 26 in Salt Lake City, Utah.