Isner continues winning streak in Houston

American John Isner is into the Houston quarterfinals, extending his winning streak to eight matches.

The top seed at the ATP claycourt event served 13 aces and did not face a break point as he recorded a comfortable 6-4 6-2 win over Switzerland’s Henri Laaksonen in the second round.

Isner, who won his first ATP Masters 1000 title in Miami a fortnight ago, now faces Davis Cup teammate Steve Johnson in the quarterfinals.

Johnson, the tournament’s defending champion, moved into the final eight with a 6-3 6-4 win over rising star Frances Tiafoe.

Fellow American Taylor Fritz also booked a quarterfinal spot, upsetting seventh seed Ryan Harrison 3-6 6-0 6-3.

Edmund finding form in Marrakech

Brit Kyle Edmund continued his form revival in Marrakech with a 6-2 6-4 win over Moldova’s Radu Albot.

The 23-year-old had not won a match since his stunning Australian Open semifinal run, but has turned his fortunes on Moroccan clay.

Edmund, the tournament’s second seed, next faces Tunisian wildcard Malek Jaziri. Jaziri defeated eighth seed Mischa Zverev 6-2 6-4 in the second round.

Seguel stuns in Bogota

Chilean qualifier Daniela Seguel has continued her stunning week at the WTA tournament in Bogota, beating top seed Tatjana Maria in the second round.

The No.191-ranked Seguel, who this week became the first Chilean player to win a WTA main draw singles match since 1980, dropped only four games to defeat Maria.

“I’m really proud because I work every day to make history for my country,” Seguel told wtatennis.com.

Victory for Seguel!

The ???????? qualifier stuns top seed Maria in straight sets @CopaWTABogota! pic.twitter.com/ihTk2lYTwp

— WTA (@WTA) April 12, 2018

Seeds tumble in Lugano

Top seed Kristina Mladenovic, fourth seed Anett Kontaveit and fifth seed Svetlana Kuznetsova all lost rain-interrupted first round matches at the WTA event in Lugano.

Mladenovic retired with a back injury in her match against German qualifier Tamara Korpatsch, while Kontaveit also lost to a qualifer, Belarusian Vera Lapko.

Kuznetsova’s campaign ended in a three-set loss to German Mona Barthel.

Belarusian Aryna Sabalenka is the first into the quarterfinals, beating Slovenian Polona Hercog 6-3 6-1 in the only completed second-round match.