Kathleen Baker sets backstroke world record

 California: Rio Olympics silver medallist Kathleen Baker set a world record in the women's 100 metres backstroke at the US Championships on Saturday, clocking a time of 58.00 seconds in Irvine. 

The 21-year-old had a sizzling first 50m and turned in 27.90 before going on beat the previous mark of 58.10 set by Canadian Kylie Masse.