LONDON, June 12 : Top seed Elena Rybakina came within two points of being sliced out of the Queen's Club Championships by defending champion Tatjana Maria but switched on the power to reach the quarter-finals with a 6-7(4) 7-5 6-0 victory on Friday. The Kazakh will be back on court later for her quarter-final against Britain's Katie Boulter as tournament organisers play catch-up after persistent rain washed out play on Thursday to leave a backlog of matches. Boulter beat Romania's Jaqueline