She said Serena Williams - who made her return at this year's tournament after having a baby in September - "should have been seeded number one, because she left as number one in the world".
Kerber thus extends her head-to-head lead over Garcia to 4-2, and avenges her loss to the Frenchwoman in their most recent match - a first-round encounter previous year at the Dongfeng Motor Wuhan Open that kickstarted Garcia's run to back-to-back titles in Wuhan and Beijing and a spot in the Top 10.
"Not taking the ranking because she didn't play tournaments, but just protected ranking for - I don't know how many tournaments you have, like, eight". Halep needs to be at her best moving forward. The seventh seed then rallied from 0-40 on her serve to give herself three chances to hold for 2-3.
"I wasn't missing that much", she said.
Halep advances to the quarter-finals and will face unseeded Petra Martic of Croatia, who advanced to the last eight with a straight sets 6-3, 7-6 (7-4) win against Czech Marketa Vondrousova on Tuesday.
Halep, bidding to become the 12th top seed to lift up the trophy and repeat her 2015 title-run, will spend her 18th and 19th weeks as World No.1 during Indian Wells, moving her past Jennifer Capriati (17 weeks) and Jelena Jankovic (18 weeks).
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Simona Halep is into the quarterfinals at Indian Wells.
Halep needed just 76 minutes on the main stadium court to dispatch Wang as she won 64 percent of her first-serve points and broke Wang's serve seven times.
But she added, "I am still young so I have to work on everything". "I am confident. I am feeling the game", she said. She is on the verge of her second career singles title at Indian Wells.
"I knew it would be like that because we practised a few days ago and she beat me in practice", she added.
"I stayed so many weeks off with injury and now coming back, so I was a little bit exhausted".
Former world number one Karolina Pliskova used her powerful serve to overwhelm 16-year-old Amanda Anisimova and reach the quarter-finals for the third year in a row.