Top seed Jelena Jankovic eased into the semi-finals of the Monterrey Open after a comfortable win over fifth-seeded Anastasija Sevastova.

Top seed Jelena Jankovic booked her place in the last eight of the Monterrey Open with a straightforward victory over Austria's Sybille Bammer.

Anastasia Pavlyuchenkova made an uncertain start to the defence of her Monterrey Open title after being pushed all the way in her first-round encounter with Eleni Daniilidou.

Latvian teenager Anastasija Sevastova claimed easily the biggest win of her career as she knocked out top seed Jelena Jankovic in the first round of the Monterrey Open.

Roger Federer admitted he is facing an important week in his season after breezing into the third round of the Miami Masters.