Daily tennis results round-up (13/4)

Former French Open champion Francesca Schiavone has found form on clay, outclassing top seed Kiki Bertens to reach the semifinals at the Claro Open Colsanitas in Bogota.

The 36-year-old Italian, who has slumped to world No.168, needed an hour and 15 minutes to secure a 6-4 6-1 victory over the player ranked 148 places higher.

Top seed Grigor Dimitrov was similarly upset by veteran Tommy Robredo at the Grand Prix Hassan II in Marrakech. The Spaniard claimed a 6-4 1-6 6-1 victory to set up a quarterfinal against Benoit Paire.

Grand Prix Hassan II, Marrakech, Morocco – ATP 250
Second Round
[PR] T. Robredo (ESP) d [1] [WC] G. Dimitrov (BUL) 64 16 61
[3] P. Kohlschreiber (GER) d J. Chardy (FRA) 60 26 63
J. Vesely (CZE) d [4] M. Zverev (GER) 64 64
[5] P. Lorenzi (ITA) d [Q] G. Quinzi (ITA) 76(5) 26 64
[6] B. Paire (FRA) d R. Albot (MDA) 62 62
J. Struff (GER) d [WC] A. Ahouda (MAR) 63 64

Fayez Sarofim & Co. US Men’s Clay Court Championship, Houston – ATP 250
Second round
[1] J. Sock (USA) d [PR] T. Haas (GER) 64 36 63
[2] J. Isner (USA) d [Q] L. Mayer (ARG) 67(5) 76(3) 63
[3] S. Querrey (USA) d H. Zeballos (ARG) 64 64
[4] S. Johnson (USA) d D. Brown (GER) 76(12) 64
[5] F. Verdasco (ESP) d N. Kicker (ARG) 76(4) 61
[6] F. Lopez (ESP) d H. Chung (KOR) 46 62 61
[8] T. Bellucci (BRA) d [Q] M. Gonzalez (ARG) 26 76(5) 62
[WC] E. Escobedo (USA) d T. Monteiro (BRA) 46 64 64

Claro Open Colsanitas, Bogota, Colombia – WTA International
Quarterfinals
[WC] Francesca Schiavone (ITA) d [1] Kiki Bertens (NED) 6-1 6-4
[3] J Larsson (SWE) d Sara Errani (ITA) 7-5 6-4
[4] L Arruabarrena (ESP) d Aleksandra Krunic (SRB) 7-5 5-7 6-2
S Sorribes Tormo (ESP) d [5] M Linette (POL) 6-4 4-6 7-6(5)

Ladies Open Biel Bienne, Switzerland – WTA International
Second round
[Q] M Vondrousova (CZE) d A Beck (GER) 6-1 6-3
[Q] A Sasnovich (BLR) d V Golubic (SUI) 6-1 6-4
C Giorgi (ITA) d [2] [WC] C Suárez Navarro (ESP) 2-6 7-6(5) 6-2
[1] B Strycova (CZE) d C Witthoeft (GER) 6-2 7-6(6)