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(Reuters) - Rio Olympics silver medalist Kathleen Baker set a world record in the women’s 100 meters backstroke at the U.S. championships on Saturday, clocking a time of 58.00 seconds in Irvine, California.

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.