Kerber loses to qualifier Riske

As second round matches began in Europe, a few first round matters needed clearing up.

In Halle, lucky loser in qualifying Nikoloz Basilashvili defeated wildcard Rudolf Molleker 6-4 7-6(5)

In Mallorca, qualifier Alison Riske upset Angie Kerber (2) 5-7 6-2 6-1.

Second round results:

Halle:

Yuichi Sugita defeated Dominic Thiem (3) 6-2 7-5

He will play Denis Kudla in the quarter finals 

Qualifier Denis Kudla defeated Stefanos Tsitsipas 6-3 6-4

Karen Khachanov defeated Kei Nishikori (7) 6-2 6-2

He will play Roberto Bautista Agut in the quarter finals 

Roberto Bautista Agut (4) defeated Robin Haase 6-4 7-5

London:

Marin Cilic (1) defeated Gilles Müller 4-6 6-3 6-3

He will play Sam Querrey in the quarter finals 

Sam Querrey (5) defeated Stan Wawrinka 7-5 6-7(3) 6-1 in an enthralling contest for at least two sets

Jérémy Chardy defeated Daniil Medvedev 7-6(6) 6-3

He will play Frances Tiafoe in the quarter finals 

Frances Tiafoe defeated Leonardo Mayer 6-4 2-6 6-4

Birmingham:

Magdaléna Rybáriková defeated Kiki Mladenovic 3-6 6-2 6-1

She will play Dalila Jakupovic in the quarter finals 

Qualifier Dalila Jakupovic was ahead of Naomi Osaka (3) 6-3 but the Japanese number one had been clearly struggling with an injury, and despite receiving treatment, Naomi retired before the second set commenced.

Mihaela Buzarnescu defeated Petra Martic 4-6 6-3 6-2

She will play Elina Svitolina in the quarter finals 

Elina Svitolina (2) defeated Alizé Cornet 6-4 6-2

Mallorca:

Caroline Garcia (1) defeated qualifier Johanna Larsson 6-4 6-3

She will play Sofia Kenin in the quarter finals 

Qualifier Sofia Kenin defeated Alison Van Uytvanck 2-6 6-4 6-4

Tatjana Maria defeated Carina Witthöft 7-6(1) 6-3 in an all German clash

She will play the winner of Vika Azarenka and Lucie Safarova (7) in the quarter finals 

Samantha Stosur defeated wildcard Lara Arruabarrena 6-3 6-4

She will play the winner of Polona Hercog and qualifier Alison Riske in the quarter finals