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No.5 seed Alona Bondarenko was knocked in the first round of the Prague Open by her unseeded sister Kateryna.
Alona was the hot favourite to win the encounter but was upset by her younger sibling who swept her aside 6-1, 6-3.
Alona, 24 years-old and Kateryna 22, had split their six previous meetings 3-3; but this time it was little sister who came through and now leads the head-to-head advantage 4-3.
Kateryna will now face Germany’s Kristina Barrois, who beat Ioana Raluca Olaru 5-7, 6-1, 7-5.