Roger Federer believes Novak Djokovic could feel the pressure at the US Open and is predicting an epic tournament at Flushing Meadows.
Djokovic ended a two-year grand-slam drought at Wimbledon last month to win one of tennis' big-four tournaments for the 13th time.
The 31-year-old has been installed as favourite in New York by some bookmakers, with Rafael Nadal and Federer not far behind.
Federer is excited to see Djokovic return to form but does not know how the added pressure from his Wimbledon win will affect his rival.
Addressing the media before his Cincinnati Masters campaign, he said: "Novak can play with less pressure again I guess, to some extent, but you can always get caught up in the pressure, the media saying 'well clearly now you're going to win the US Open', and you're like 'well, I guess so, yes'.
"And then rather than you being able to say 'well, we'll see what happens', perspective changes from your side but also from the media.
"But it's definitely exciting times, a lot of the best players are back in the game and I think the US Open is going to be epic.
"Novak winning Wimbledon, obviously that was massive, I don't think he expected it.
"I remember the press conference he gave [after losing to Marco Cecchinato] in Paris when he was like 'I don't know yet, I was frustrated, I just want to get out of here'.
"And people were asking him 'what, you're not going to play the grass?' And then he should have won Queens and goes on to win Wimbledon, so things can turn very quickly, regardless if you're positive or not.
"Sometimes when you just put yourself out there and then you get excited in a quarters or semis of a slam you can start playing your best tennis.
"I thought it [Djokovic winning Wimbledon] was great for the sport, I'm happy for him because I know it probably it hasn't been easy the last couple of years for him but then again I don't think anybody should be feeling sorry for him, like people feeling sorry for me or Rafa, we've had so much success that it's just more beautiful when you do come back after a tough time."
|Pellegrini: It was not a good idea for Arnautovic to play|
|Iran v Oman: We´re not satisfied yet, says Al Mahaijri|
|Carbery sends Munster through and ends Exeter´s lingering Champions Cup hopes|
|Dyche defiant despite offside call|
|Hasenhuttl rates Everton win as Southampton´s best|
|Benitez looking up the table after Schar inspires win over Cardiff|
|RB Leipzig 0 Borussia Dortmund 1: Witsel restores six-point cushion|
|Swansea City 1 Sheffield United 0: McBurnie punishes wasteful Blades|
|Cardiff sign Sala from Nantes for club-record fee|
|Arsenal 2 Chelsea 0: Lacazette and Koscielny fire Gunners to rousing derby win|
|Huesca 0 Atletico Madrid 3: Dominant Atleti keep pressure on Barca|
|Rashford arguably league´s best striker with Kane out - Solskjaer|
|Hafeez plays steady hand as Pakistan punish Proteas´ patient approach|
|Klopp: Exceptional Salah would have scored even more up front!|
|Suspected ´serious´ Verratti injury leaves Tuchel with mixed emotions|
|We needed to rediscover our best form - Ramos pleased for Real Madrid fans|
|City bought Guardiola four full-backs! - Mourinho aims dig at Man Utd transfer policy|
|Valverde ´not frustrated´ amid De Jong & Vela links|
|Championship Review: Leaders Leeds beaten at Stoke as Villa end Hull run|
|Bournemouth rode their luck, admits Howe|
|Barca boss Valverde calls for clarity on RFEF rules|
|Bears rack up 107 points in routing Enisei en route to quarter-finals|
|Paris Saint-Germain 9 Guingamp 0: Verratti injured for rampant champions|
|Solskjaer: I´ll remember managing United for the rest of my life|
|Palace win a ´massive relief´ for Liverpool boss Klopp|
|Salah fourth fastest to 50 goals in Premier League history|
|Real Madrid 2 Sevilla 0: Solari´s side take over third spot|
|Watford 0 Burnley 0: Wood denied winner by contentious call|
|Liverpool 4 Crystal Palace 3: Salah reaches 50 thanks to Speroni shocker|
|Newcastle United 3 Cardiff City 0: Schar double moves hosts out of bottom three|
|Southampton 2 Everton 1: In-form Saints steer clear of trouble|
|Bournemouth 2 West Ham 0: Wilson and King sink Pellegrini´s men|
|Manchester United 2 Brighton and Hove Albion 1: Record-breaking win for Solskjaer|
|Pelicans star Anthony Davis out for one to two weeks with sprained finger|
|Verratti hobbles off for PSG against Guingamp|
|Brook ponders next move after missing out on Khan|
|Mick Schumacher: The Ferrari academy graduates who made it to F1|
|Thailand v China: Lippi aims to overcome War Elephants and reach last eight|
|I deserved red card, says Wolves boss Nuno|
|Mick Schumacher joins Ferrari Driver Academy|
|Jared Goff not worried about Superdome noise: ´When it´s loud, we love it´|
|Rooney urged Rashford to run at defenders|
|Former Springbok Lambie retires from rugby aged 28|
|Spygate: EFL confirms 11 clubs have made contact about Leeds|
|When it´s loud, we love it - Goff ready for New Orleans noise|
|Wolves 4 Leicester City 3: Jota hat-trick drama piles pressure on Puel|
|´Asparagus´ Zverev joins frustrated Djokovic in round four|
|Lowry takes Abu Dhabi title at the last after ding-dong Sterne battle|
|Rooney: United should go "all out" for Pochettino|
|Djokovic frustrated by ´unnecessary´ Australian Open floodlights|
|Jordan v Vietnam: Park expecting ´aggressive´ encounter|
|Serena and Halep book blockbuster, Osaka won´t throw in the towel|
|Brady: Mahomes has had ´spectacular season´|
|Halep not intimidated by Serena anymore|
|Farrell´s Six Nations preparations hit by thumb injury|
|Pogba confident Manchester United can reach top four|
|Alexander-Arnold embodies Liverpool spirit - Klopp|
|Stoinis shoots Stars to Melbourne derby victory|
|A-League Review: Glory held in stalemate as Sydney close the gap|
|DeMarcus Cousins ´felt like a kid on Christmas´ in Warriors debut|
|Alexander-Arnold signs long-term contract at Liverpool|
|Pochettino eyes Messi-esque role for Alli|
|Halep sets up mouth-watering Serena showdown by conquering Venus|
|Wilder-Fury II expected for April 27 or May - Warren|
|Celtics´ Kyrie Irving on technical: If someone questions your manhood, you got no choice|
|Serena would ´love´ Halep clash|
|Djokovic sees off Shapovalov at Aus Open|
|DeMarcus Cousins scores 14 points in Warriors debut|
|´Don´t cry, you did really well´ - Serena consoles Yastremska|
|Andrade eyes Golovkin after defending middleweight title|