Indian Wells: Belgian David Goffin continued his giant-killing run at Indian Wells as he stormed into the last four of the BNP Paribas Open with a 7-6 (4), 6-2 upset victory over former US Open champion Marin Cilic on Thursday.

A day after ousting third seed Stan Wawrinka, Goffin battled through to his first Masters 1000 semi-final where he will meet Canadian Milos Raonic, a 7-5, 6-3 victor over Frenchman Gael Monfils.

Goffin saved 11 of 12 break points against tall Croatian Cilic before sealing the win in just over an hour-and-a-half and declared himself ready to take on another big server.

"It's good that in tennis you can find some solution against big players like Marin or Milos or (John) Isner," the 25-year-old told reporters.

"Maybe I'm quicker. I think I can take the ball earlier. I have other weapons. That's why tennis is a nice sport. I'm really happy with the way I managed the important points ... it was the key of the match, to win the first set, and to be more relaxed in the second."

After being forced to fighting off four set points in the opening stanza, Goffin broke 10th seed Cilic's serve twice in the second set.

Raonic pounded out 10 aces to reach the semi-finals at Indian Wells for the second straight year.

Raonic relinquished an early break to Monfils in the first set but broke back in the 12th game to go 1-0 up and carried the momentum into the second stanza before serving out for the victory after 90 minutes.

Victoria Azarenka showed little sympathy against an ailing Magdalena Rybarikova as the Belarussian eased to a 6-0, 6-0 victory over her Slovak opponent to book a semi-final berth on Thursday.

The 2012 champion polished off the opening set in just 34 minutes as she raced towards a first 'double bagel' at the tournament in two years.

Following the first set, the unseeded Rybarikova took a medical timeout to have her upper thigh taped.

Rybarikova was clearly struggling by the end of the match but the unseeded Slovakian was always fighting a lost cause as she had her serve broken six times and finished with 25 unforced errors.

Azarenka continues her rise up the rankings after two injury-hampered seasons and the former world No. 1 is exuding confidence in California this week, having dropped just one set in her tournament.

A victory in the final on Sunday would be the 15th-ranked Azarenka's second tournament win of the season after her Brisbane International triumph in January.

"I'm very happy to be playing and to be improving," she said. "It's a different stage of my career where I can work hard and enjoy myself. I see the potential and that's exciting."