"And, yeah, I'm playing (my) best matches against the best players".
It was a disappointing exit for Wozniacki, who finally silenced her critics earlier this year with her maiden Grand Slam title in Melbourne, where she defeated Simona Halep in the final.
The first Croat to reach the round 16 at Indian Wells since 1997 when Iva Majoli lost to Venus Williams collecting her first top 10 win, beat 6-3 7-6 Marketa Vondrousova.
The 26-year-old Romanian showed no sign of the foot injury that forced her to withdraw from the Qatar Open last month and is well positioned to make a run at reclaiming the Indian Wells title she won in 2015.
Speaking after her match, number one seed Halep also said tennis authorities should consider introducing a "protected seeding" system for players returning after maternity leave.
She is now an impressive 17-1 this season having already won a title in both singles and doubles in Shenzhen. She asked Darren Cahill's advice and her coach suggested her to work longer points and reduce the error count.
Halep got the better of Qiang's serve, breaking on seven of eight occasions.
After recently taking back the world No. 1 ranking from Caroline Wozniacki, Halep is off to a fantastic start at the tournament.
"It was really important, because he just told me what I have to do. I did exactly what he said after that". "I did exactly what he said after that".
Simona Halep shared a picture of herself watching Serena and Venus on Monday night, writing: "Tonight I'm just a fan of the game and the Williams sisters".
Meanwhile, Williams survived a hard fourth round test to beat Sevastova just one day after beating sister Serena for the first time since 2014 in Montreal.
She and Serena usually meet later in the draw in the semis or the championship match.
"It was not an easy match to figure out".
Halep would lose only another game as Wang became increasingly impatient off the backhand side and gifted her opponent the chance to seal her 298th main draw win with her 29th unforced error. And it was a quick comeback from yesterday, where you have the emotions of, 'Hey, this feels like a final.
Williams, who has yet to drop a set, will face either Carla Suarez Navarro or Danielle Collins in the last eight.