Angelique Kerber advances in Miami as Dominka Cibulkova and Garbine Muguruza are ousted

World number one Angelique Kerber reached the quarter-finals of the Miami Open after swiftly dealing with Japanese qualifier Risa Ozaki in a 6-2, 6-2 victory.

But fourth-seed Dominika Cibulkova of Slovakia crashed out to the Czech Republic’s Lucie Safarova and ailing French Open champion Garbine Muguruza also bowed out in the fourth round.

Kerber took control early, breaking twice to establish a 4-1 lead and she was in firm control from then on.

The German said that while her opponent may only have been ranked 87th she had studied Ozaki’s game closely before the contest.

“She came through the qualies, she beat good players, so I was ready for it,” Kerber said.

“I talked with my team and I knew that she’s moving good and bringing a lot of balls back. I was trying to play my game and be aggressive.”