Federer, the five-time USA champion from 2004-08, is bidding for a 20th major and third of the year after capturing the Australian Open and Wimbledon titles.
Andy Murray's withdrawal from the US Open has set up a fourth-round showdown between Nick Kyrgios and Roger Federer.
"I know you want to hear the other way, that I would love to play him".
Sharapova has beaten Halep six times out of six, but they have not faced each other in almost two years.
Defending champion Angelique Kerber said: "She's back and I think she practiced good the last few weeks and she's ready to be back".
World number one Karolina Pliskova says Sharapova's return is a positive move. "But, you know, whatever comes I will just take it", she said in Cincinnati where she lost to Muguruza. I think it all depends on the day, as well. We worked with passion and we played well. We have our work cut out there. "Is normal that we are still playing, we try our best, but it's normal that we have more troubles during this".
Federer turned 36 on August 8, making him older than all but two men to have ever won the U.S. Open.More news: Tottenham Hotspur: Mauricio Pochettino disappointed with late lapse in concentration after Burnley
Rafael Nadal believes introducing shot clocks into tennis would ruin the sport as entertainment.
Nadal and Federer have met 37 times. However, in the semifinals, she had to face Kristina Mladenovic who was enjoying a fantastic season. I am not that way.
"I would prefer to have a little bit more of a lead". But I haven't seen any great results. This is the fourth and final Grand Slam of the 2017 professional tennis season. "Finals are more special than semi-finals".
Last year's Wimbledon runner-up, Milos Raonic, withdrew from the Open, though, because of an injured left wrist.
"The long break previous year really helped him". "It's a good story for the tournament that she's back".
Nadal cited different ball contracts for the US Open and its main tuneup events as a problem that could be resolved. Tournaments were widely criticized for giving the former world number one a wild card, but one thing that can not be denied is that wherever Maria Sharapova plays the world will be watching. At around 20/1 she is not expected to contend but she can never be ruled out in big events.
Sharapova played only one US Open tuneup match before a forearm injury sidelined her, but she has practiced on the courts and taken inspiration from past success, notably a 2006 US Open title. The French Open denied her a wildcard and she missed Wimbledon with a thigh injury. The Russian is 6-0 against Halep, the No. 2 seed in Flushing Meadows.More news: Iraq forces break through ISIL lines into centre of Tal Afar
Women who are in contention for the No. 1 crown at the US Open.
The Spaniard always seemed to struggle at Flushing Meadows. "I'm just going to go match by match and hopefully I can get to those guys". Sure enough she made the final, only to be beaten by Garbine Muguruza.
With the last five editions of the US Open having been won by five different players, and seven players having divided the last nine US Open crowns with only Djokovic (2011, 2015) and Nadal (2010, 2013) claiming multiple titles in this span, predicting the victor of the US Open is never an easy task. Obviously Roger and Rafa are the biggest favourites still. He last swung a racket in competitive mode at the Roger's Cup in Montreal a fortnight ago, losing in straight sets to hotshot Next Gen stud Alexander Zverev while clearly enfeebled by a back issue that he only acknowledged days later. It is still hard though to not think that these prices still represent value.
As is usually the case in the Women's side of the tournament, things are a lot more open.
Rivals remain divided over Maria Sharapova as she prepares to return to Grand Slam tennis Monday at the US Open after a 15-month doping ban.
At just 23 years old, having shown the form and composure she has to be a double Open victor already, it's hard to think she won't have an impact on proceedings here. Venus Williams is the highest ranked American, seeded ninth. There she had to face the number one seed, Victoria Azarenka. "You know, maybe I'll make the next one", she said with a grin.More news: Ulta Beauty, Inc. (ULTA) Sees 52-Week Low