Barty in Hewitt-like hot start to a season May 09, 2019 by AAP / Darren Walton

SYDNEY, AAP - Ashleigh Barty has recorded the hottest start to a tennis season by an Australian in 16 years, surging into the quarter-finals of the Madrid Open with an 11th straight victory.

Now Barty faces the ultimate test of her French Open title credentials against reigning Roland Garros champion Simona Halep, undoubtedly the world's premier women's clay-court player.

Barty's 4-6 6-1 6-2 third-round defeat of Yulia Putintseva improved the 23-year-old's win-loss record in 2019 to 23-3, matching Lleyton Hewitt's start in 2003.

Like Barty this year in Fed Cup, Hewitt was also unbeaten in Davis Cup that season too, helping Australia to its 28th and most recent title in the century-old teams' event.

But to better Hewitt's surpreme start, Barty must beat Halep, the three-time French Open finalist who will arrive in Paris later this month as defending champion after breaking through for her first grand slam crown in 2018.

Barty toppled the then-world No.1 Halep in Sydney in January, but that success came on a hard court.

The Romanian world No.3 has accrued six titles on European clay, including two in Madrid, and made 13 of her 34 career finals on the surfaces.

And, ominously, Halep lauded her crushing 6-0 6-0 third-round win over world No.46 Viktoria Kuzmova as the finest performance of her career.

"I played nearly perfect today," Halep said after dropping just 12 points all match.

The reigning Roland Garros champion won 48 of the 60 points played, winning an astounding 80 per cent of the points played over the course of her 44-minute claycourt masterclass.

Halep hit 14 winners to just four unforced errors, converted six out six break points and never faced a break point on her serve.

"Not a bad statistic," Halep said. "I think it was the best match that I have ever had."

Ninth-seeded Barty knows the challenge confronting her in what will be her fourth quarter-final appearance of the year.

"I think without a doubt she's the best, most consistent clay courter out there," Barty said.

"We had a quality practice session earlier this week. It was nice. The first time we've hit together and it was a really good level.

"It's the absolute test, to play against the best."

Madrid titleholder Petra Kvitova, meanwhile, beat France's Caroline Garcia 6-3 6-3 to set up a rematch of last year's final with Kiki Bertens, a 6-1 6-2 winner over Anastasija Sevastova.

Top-ranked Naomi Osaka reached the quarter-finals with a 6-2 6-3 win over Aliaksandra Sasnovich and will next face Belinda Bencic, who beat Kateryna Kozlova 6-0 6-2.

Sloane Stephens needed three sets to defeat Saisai Zheng 3-6 6-3 6-2.

Stephens will meet Petra Martic, who earned a second walkover in a row when her compatriot Donna Vekic retired in the third set of their match.