Johnson scored personal and season bests in the 100 backstroke .
Johnson took the title with a time of 0 : 55.96 while Chatwin had a sixth place finish of 1 : 01.48 .
Scoring personal and season bests in the 100 backstroke , Johnson took the title with a time of 0 : 55.96 while Chatwin had a sixth place finish of 1 : 01.48 .