Evans sees off Herbert as Kyrgios launches rant after crowd go loco in Acapulco

flat. But he recovered from 2-5 to win the opening set and extended his winning run to six games with a break to start the second, only for Herbert to win six of the next eight games.

The clash came down to a deciding tie-break, where Evans trailed 4-6 and 6-7, but his fighting spirit was to the fore once again as he battled to a 7-5, 3-6, 7-6 (7) victory after two hours and 46 minutes.

In the quarter-finals, the British No 1 will face sixth seed

Andrey Rublev, who defeated Filip Krajinovic 7-6 (3), 6-0.

In Acapulco Nick Kyrgios branded the Mexican Open crowd disrespectful after being booed off court.

The Australian was the defending champion but lasted only a set of his first-round match against Ugo Humbert, which he lost 6-3, before retiring with a wrist injury.

In an expletive-laden press conference, Kyrgios said: “I’m not healthy. I tried to come here, I tried to play. I’ve been doing media here, and helping out. I tried to play, I tried to give the fans a little bit of tennis. And then they’re disrespectful.”

It was Kyrgios’ first match since his entertaining run at the Australian Open, which saw him lose in the fourth round to Rafael Nadal.

Once again, Kyrgios’ body has proved fragile, with the 24-year-old pulling out of tournaments in New York and Delray

Beach before deciding to give it a go in Acapulco.

Kyrgios added: “My wrist is just not ready to play. I could feel it on every backhand. It’s unfortunate after the memories I had last year. It’s tough for me.”

Top seed Nadal, who lost to Kyrgios in the second round 12 months ago, made light work of Pablo Andujar in a 6-3 ,6-2 victory, and second seed Alexander Zverev saw off Jason Jung 7-6 (6), 6-1.