Miami Open Masters 2018 Results: Sloane Stephens Wins, Simona Halep Upset

As the weekend moves on in Key Biscayne, Florida, the 2018 Miami Open Masters field continues to narrow as the tournament reaches the later rounds.

The action is heating up, as the world's top-ranked players got all they could handle and then some.

Here's a recap of Saturday's action:

Miami Open Masters 2018 Results, Saturday

Women's Draw

Scores

No. 30 Agnieszka Radwanska def. No. 1 Simona Halep (3-6, 6-2, 6-3)

No. 5 Karolina Pliskova def. Su-Wei Hsieh (6-4, 1-6, 7-6 [7-4])

No. 10 Angelique Kerber def. No. 23 Anastasia Pavlyuchenkova (6-4, 6-4)

Victoria Azarenka def. No. 20 Anastasija Sevastova (3-6,, 6-4, 6-1)

Zarina Diyas def. Carina Witthoeft (4-6, 7-5, 6-0)

Yafan Wang def. Alison Riske (6-4, 3-6, 7-6 [7-4])

No. 13 Sloane Stephens def. Monica Niculescu (6-7 [1-7], 6-3, 4-0; retired)

No. 3 Garbine Muguruza def. Christina McHale (6-2, 6-1) 

Full results and updated draw available courtesy of WTATennis.com.

Recap

While plenty of top seeds found ways to win their matches Saturday, the same could not be said for the world's No. 1.

Simona Halep went down in three sets to No. 30 Agnieszka Radwanska despite a strong start:

Halep entered the match 19-2, while Radwanska rode a three-match losing streak into the tournament. Between that and the rankings, the odds seemed to be in Halep's favor. However, the two have been even throughout their careers, with Radwanska now owning a 6-5 advantage head-to-head. 

Afterward, Radwanska reflected on her first win over a world No. 1 in six years:

It marked just Radwanska's second victory in their last five meetings.

For Angelique Kerber, Saturday was a time to put past failures behind her. She faced her third-round opponent, Anastasia Pavlyuchenkova, three times last year. All three matches ended the same way: in a loss.

Not today.

With the world's top player out, the rest of the field will battle for the Miami Masters Open title.

Men's Draw

Scores

Thanasi Kokkinakis def. No. 1 Roger Federer (3-6, 6-3, 7-6 [7-4])

No. 4 Alexander Zverev def. Daniil Medvedev (6-4, 1-6, 7-6 [7-5])

No. 10 Tomas Berdych def. Yoshihito Nishioka (6-1, 6-4)

No. 11 Sam Querrey def. Radu Albot (7-6 [7-4], 6-1)

Frances Tiafoe def. No. 21 Kyle Edmund (7-6 [7-4], 4-6, 7-6 [7-5])

No. 28 David Ferrer def. Evgeny Donskoy (6-2, 6-2)

No. 8 Jack Sock vs. Yuki Bhambri (6-3, 7-6 [7-3])

Full results and updated draw available courtesy of ATPWorldTour.com.

Recap

Like in the women's draw, the world's No. 1 men's player could not manage to survive Saturday.

Roger Federer found himself on the wrong side of a historic upset. Thanasi Kokkinakis managed to overcome a first-set loss to battle back for the victory:

Kokkinakis, who entered the match ranked 175th in the world, became the lowest-ranked player in 15 years to take down the No. 1 player:

"This is nuts," Kokkinakis said, per ATPWorldTour.com. "It's an unreal week for me. I've trained with [Federer] a bunch of times and he's a great role model for the sport, but I took what I learned and played my game and executed. I didn't put a lot of scoreboard pressure on him, but when I'm playing on my terms I don't feel there are too many people that can go with me. I just needed to play my game and aggressive tennis."

Even though he lost, Federer did manage to pull off a highlight-reel shot:

But like the match, he wound up losing that point.

It will prove to be a costly match, as Stuart Fraser of The Times points out:

Federer started this year 18-0, but he has lost both of his last two matches. That has him in unfamiliar territory, per Ben Rothenberg of the New York Times:

Of course, Federer wasn't the only one playing on this day.

Notable Sunday Matches

Women's Draw

No. 22 Elise Mertens vs. No. 11 Johanna Konta (11 a.m. ET)

No. 8 Venus Williams vs. No. 29 Kiki Bertens (Follows Mertens-Konta)

No. 6 Jelena Ostapenko vs. Beatriz Haddad Maia (Follows Cilic-Pospisil)

No. 26 Daria Gavrilova vs. No. 4 Elina Svitolina

No. 21 Ashleigh Barty vs. Petra Martic (11 a.m. ET)

Men's Draw    

No. 5 Juan Martin Del Potro vs. No. 26 Kei Nishikori (Not before 2 p.m. ET)

No. 3 Grigor Dimitrov vs. Jeremy Chardy (Follows Del Potro-Nishikori)

No. 13 Diego Schwartzman vs. No. 20 Milos Raonic (Not before 9 p.m. ET)

No. 2 Marin Cilic vs. Vasek Pospisil

No. 14 John Isner vs. Mikhail Youzhny (Follows Ostapenko-Haddad Maia)

Full schedule can be viewed at ATPWorldTour.com