June 18 (Reuters) – World number two Elena Rybakina suffered another stumble in the lead up to Wimbledon as Alexandra Eala beat her 7-5 6-4 in the last 16 at the Berlin Open on Thursday. Kazakhstan’s Rybakina, who won the Australian Open this year and will launch her bid for a second Wimbledon crown later this month, had lost to Katie Boulter in the quarter-finals at Queen’s Club last week.