No. 8 seed Madison Keys was the bigger hitter and favorite on paper Sunday, but unseeded Caroline Wozniacki gave her a lesson in controlled aggression and the mentality of a champion as the former No. 1 upset the American 6-3, 6-4 to move into the quarterfinals at the US Open.

“It’s been a good week,” said Wozniacki, who covered the court like her days at the No. 1 ranking. “I’m …

Rafael Nadal suffered one his tough losses of his career Sunday at the US Open, falling to 22-year-old Lucas Pouille 6-1, 2-6, 6-4, 3-6, 7-6(6).

Nadal was blown out early with the Frenchman dictating from the baseline. But Nadal revved up his game to take the second. The see-saw continued and a fifth was forced, and it was Rafa getting the early break for 2-0. But Pouille, who had played two …

Stan Wawrinka stayed alive at the US Open by the skin of his teeth saving a match point in a tough win over Briton dan Evans in five sets 4-6, 6-3, 6-7(6), 7-6(8), 6-2.

Evans, who was trying to join countryman Andy Murray and Kyle Edmund in the fourth round, held a match point at 6-5 in the fourth set breaker.

“I was frustrated, for sure, to be down two sets …

World No. 1 Serena Williams needs to outlast world No. 2 Angie Kerber to keep her top ranking during this fortnight at the US Open. On Saturday she did so in dominant and further record-setting fashion, thumping unseeded Swede Johanna Larsson 6-2, 6-1 to move into the round of 16 and record an Open Era record 307th win at a grand slam tournament.

Win No. 307 tied her with Roger Federer …

Thanks to days and days off, Novak Djokovic said many of the injuries he’s been carrying – right arm and left wrist – are getting better. The Serb has enjoyed addition time to rest after Jiri Vesely withdrew Wednesday and yesterday Mikhail Youzhny retired after just six games.

“The arm is doing very well,” Djokovic said. “Everything is going in the right direction. I feel significantly better now than I have …

Rafael Nadal capped a terrific first week at the US Open with this incredible tweener that set-up match point Friday night against Andrey Kuznetsov.

“Not many times, but I remember one in Madrid against Djokovic,” Nadal said of hitting a successful tweener.

Nadal goes into his first week 2 at a Grand Slam since the 2015 French, and so far he hasn’t …

In a series of tweets, Roger Federer revealed he’s not watching the US Open, he’s out hiking in the Swiss Alps.

Missing the @usopen, but having an amazing time enjoying the Swiss mountains #OnTheMoveWithRF #Switzerland pic.twitter.com/xmtHqS72ix

— Roger Federer (@rogerfederer) September 3, 2016

🍝 with a ⛰ #Appenzell 🇨🇭 pic.twitter.com/oNXy0pf8Oo

— Roger Federer (@rogerfederer) September …

Rafael Nadal finished off the first week of the US Open in style routing Russian Andrey Kuznetsov 6-1, 6-4, 6-2 in the third round Friday night.

“I think I played well tonight,” Nadal said. ‘Very happy about the way I played. First set especially was very high level.”

The win lifted Nadal into his first Grand Slam fourth round since the 2015 French Open where he made the quarterfinals losing to Novak …

American heir to the Williams sisters Madison Keys completed an amazing comeback to set up a first-time meeting with former No. 1 Caroline Wozniacki, last year’s ageing Italian finalist Roberta Vinci refuses to lose, and Angie Kerber kept alive her hopes of overtaking world No. 1 Serena Williams on an eventful Friday in third-round play at the US Open.

The No. 8-seeded Keys trailed 1-5 in the third before battling back …

Serena Williams doesn’t need any help, but help comes anyways. Last night during a 63, 63 win over Vania King, Serena had the added support of two of the biggest stars in entertainment, Beyonce and husband Jay-Z.

“It’s always good to have Beyonce and Jay in the box,” Serena said.

More importantly, the win for Serena tied her with Martina Navratilova at the top of Open Era Grand Slam match wins at …

Who cannot be happy to see Juan Martin del Potro playing big time tennis again? After one surgery on his right wrist and three on his left, and after nearly retiring from the sport a year ago, the Argentine is once again a factor on the pro tennis courts, and fans love it.

Last night, even against an American Steve Johnson, del Potro had support from the crowd.

“I feel that for …

After an easy opening win over Diego Schwartzman, Juan Martin del Potro finally met a challenge Thursday night on Arthur Ashe against Steve Johnson, the highest seeded American man in the field. And del Potro met the challenge with flying colors cruising past the No. 19 seed 7-6(5), 6-3, 6-2 to advance to the third round.

The win was del Potro’s first under the lights in New York where he had …

An off day for world No. 1 Serena Williams on Thursday still resulted in a win as the American moved into the third round after a 6-3, 6-3 win over fellow American and No. 87-ranked Vania King.

“Hopefully I’ll be able to play better as the tournament goes on,” said Serena, whose serve was one of the few things firing, landing 13 aces. “So far, so good,” she said regarding the …

Rafael Nadal made history last night become the first player to win a match under the new $150 million Arthur Ashe roof at the US Open. Nadal was playing Italian Andreas Seppi when rain drops start falling at the US Open just past 10:30pm.

At 10:39pm and 3-3 in the second set, play was stopped and the roof closed in just 5-minutes, 35-seconds. Once play resumed at 10:46pm, Nadal struggled a …

Marin Cilic comes into the US Open as one of the hottest players after winning his first Masters title in Cincinnati 10 days ago. Cilic kept is run going crusing Sergiy Stakhovsky to set up a showdown with American Jack Sock on Friday.

Cilic lead Sock by a break in the fifth set at Davis Cup two months ago before losing. Cilic and team Croatia still won the tie, but Marin …