Alexander Zverev, a 19-year-old German 16th-seed, stunned at the Miami Open on Tuesday by defeating top-seed Stan Wawrinka on the Swiss star’s 32nd birthday.

Roger Federer, Rafael Nadal Reach Miami Open Quarterfinals

Zverev, who also beat 2016 U.S. Open champion Wawrinka at the St. Petersburg Open in September to claim his first ATP title, topped the Swiss 4-6, 6-,2 6-1 to reach the Miami Open quarterfinals.

The German will next face 12th-seeded Australian youngster Nick Kyrgios on Thursday morning at 10 am EST. Kyrgios defeated Belgian David Goffin. 

Fifth-seeded Spaniard Rafael Nadal, meanwhile, saw off Frenchman Nicolas Mahut 6-4, 7-6 (4), while fourth-seed Roger Federer eliminated 14th-seeded Spaniard Roberto Bautista Agut, 7-6 (5), 7-6 (4). Federer will play tenth-seeded Czech Tomas Berdych in Thursday morning’s other quarterfinal. Nishikori will face Italian Fabio Fognini on Wednesday afternoon (3 pm EST), while Nadal will play 24-year-old American Jack Sock, a 13th-seed from Nebraska, on Wednesday night (9 pm EST).

Sock had beaten compatriot Jared Donaldson 6-2, 6-1, and Fognini eliminated American Donald Young, 6-0, 6-4. Federer’s win was his 16th in 17 matches in 2017.

Second-seed Kei Nishikori of Japan, a finalist at Key Biscane last year, rallied from a break down in the last set to top Argentina’s Federico Delbonis 6-3, 4-6, 6-3.

Second-seeded Czech Karolina Pliskova reached the women’s semifinals with a 6-3, 6-4 win over 26th-seeded Croatian Mirjana Lucic-Baroni.

Caroline Wozniacki progressed to the women’s semi-finals with a straight sets win over Lucie Safarova.

The Danish former world number one, seeded 12th in Miami, was a 6-4 6-3 winner against her Czech opponent.

Wozniacki and Pliskova will face off on Thursday morning (10 am EST).

Top-seeded German Angelique Kerber and 11th-seed Venus Williams will play each other in Wednesday night’s quarterfinal at 7 pm EST.

KEY BISCAYNE, FL – MARCH 28: Alexander Zverev of Germany in action against Stan Wawrinka of Switzerland at Crandon Park Tennis Center on March 28, 2017 in Key Biscayne, Florida. (Photo by Julian Finney/Getty Images)

Angelique Kerber reached her third major final of the year on Thursday after beating Denmark’s Caroline Wozniacki in straight sets, 6-4, 6-3 at the US Open in Flushing Meadows, and became the tournament’s No. 1-seed.

US Open 2016 Day 11: Angelique Kerber Beats Caroline Wozniacki To Become No. 1, Serena Falls In Semifinal

At 28, Kerber is the oldest woman to reach No. 1 for the first time, and is the first German to do so since her idol and mentor, Steffi Graf.  

She will now face 10th-ranked Czech Karolina Pliskova in Saturday’s final. Pliskova saw off former top-seed Serena Williams 6-2 7-6 (7-5) in Thursday’s other semifinal.

At the beginning of 2016, Kerber had never reached a Grand Slam final. Now, she could end the year as a two-time major champion.

In January, she advanced to the Australian Open final and defeated Williams. Kerber also played for the championship at Wimbledon; however, she lost to Williams. Kerber also lost the Cincinnati Open final to Pliskova on Aug. 21.

Kerber would have overtaken Williams for the top seed had she beaten Pliskova in that match. Instead, Pliskova won that title and has been enjoying the momentum ever since.

“After that, I was just telling myself, ‘OK, I will get one more chance,’ ” Kerber said. “Now after I can relax a little bit and try to enjoy this special night today.”

The German added she tried hard not to think about her potential climb in the rankings if she won.

“I’m growing and I’m not putting the pressure on my shoulders if something like this happens,” she said.

On match point, Kerber fired a backhand that seemed to be heading long, and Wozniacki was going to let it go until she realized the ball may have tipped the baseline. She swung too late and sent the ball flying out to end the mach, and didn’t challenge the call.

“I got a few texts, but that just made me feel worse,” Wozniacki, 26, said. “But at the end of the day, I don’t think [challenging] it would have made a difference.”

Typically content to play defensively, Wozniacki found herself attempting to force the issue and committed an uncharacteristic 26 unforced errors.

A two-time runner-up at Flushing Meadows, she entered this year’s tournament ranked 74th in the world after missing 2 1/2 months due to an ankle injury. She was seeking to become the lowest-ranked women’s finalist at the US Open, other than an unranked Kim Clijsters (from Belgium) in 2009.

“Probably people ruled me out, but it’s nice to prove people wrong once again,” Wozniacki said.

The Danish star declined to answer a question regarding reports that her father told the media she could retire in the next year or two.

Before her semifinal loss to Pliskova, Williams, 34, had been No. 1 for 186 straight weeks.

The American told reporters post-match on Thursday that she was dealing with a left-knee injury.

After serving impeccably through the quarterfinals, Williams committed five aces and six double faults Thursday. Williams had averaged 12 aces per match in the tournament prior to the last four and struck 18 against Halep.

Unfairly known for her tabloid break up with golf star Rory McIlroy, Caroline Wozniacki has created a nice career for herself: the 24-year-old athlete is fifth ranked on the WTA Tour and has appeared in two U.S. Open Grand Slam finals.

And according to the behind-the-scenes featurette, the swimsuit issue could not have come at a better time: she was in the midst of training for the New York City Marathon, which kept her in fantastic shape for the 2015 tennis season and this photo shoot.

Obviously, the photos came out stunning, which is a testament to her beauty and Walter Iooss Jr.’s eye: though he had an easy subject to work with, his photography has given life to what some only consider as bikini shots.

Well Sports Illustrated’s Swimsuit Issue is back and it features Derek Jeter’s girlfriend, Hannah Davis, on the cover. But what about the athletes: every year, the swimsuit edition has a few of the best women athletes posing in the issue.

This year the famous issue features UFC fighter Ronda Rousey and tennis star Caroline Wozniacki. For those who do not know, Rousey is the hottest female star in the UFC — she sits on top undefeated with the Women’s Bantamweight Title. On top of this, she is a bronze medal winner at the 2008 Beijing Olympic Games and has won two gold medals at the Pan American Judo Championships.

As for tennis star Caroline Wozniacki, though she is famous for her break up with Rory McIlroy, she is an accomplished tennis star. The Danish athlete is a two-time US Open finalists, a former number one in the world and has an all-time singles record of 441-171. She currently sits number five on the WTA world rankings.

https://twitter.com/livetennis/status/565161248481107968

To see more pictures from SI Swimsuit head over to their website.