Justin Thomas did not want to "compare Cadillacs" when asked which of Tiger Woods or Phil Mickelson would be pulling off the more significant achievement with victory at the U.S. Open this week.
Woods is looking to win his 15th major and first since his playoff triumph over Rocco Mediate at the 2008 U.S. Open.
Meanwhile Mickelson, having finished runner-up at the U.S. Open six times, has eyes on completing a sweep of all the majors, a feat Woods has already achieved.
Speaking at a media conference, Thomas, who clinched his first major at the 2017 US PGA Championship, responded to a question about Woods and Mickelson's prospective achievements at a media conference by saying: "You're comparing Cadillacs there, you know.
"It's not - they're both pretty - it would be unbelievable achievements.
"I mean, obviously, for Phil to complete the Grand Slam would be tremendous. And then, you know, if and when Tiger does win more majors, it's just another major.
"It's hard to compare and say one would be better than the other. I think you just would have to recognise greatness if either one of them happened."
Shinnecock Hills is expected to provide a sterner test than other U.S. Open courses in recent years, though it has been extended to 7,445 yards.
Asked if being a long hitter will be important this week, Thomas added: "Putting it in the fairway is definitely going to matter more than anything, but it's not playing - at least when I played, it wasn't playing very fast by any means. It was good. You know, the ball would roll a little bit, but it's not like you're hitting two-irons that are going 300 or anything. For that reason, I'm not using a two-iron this week.
"It's just not a place where you get the ball on the ground and it rolls forever. They had some good rain last week, and that's just how it is right now. If they continue to get the conditions they want or how firm they want to get the course, they can get it like that.
"But, I mean, I would like to think I have an advantage if I drive it well, versus an average driving distance person. Hitting eight or nine-irons into these greens, as opposed to six-irons, is a big deal.
"At the end of the day, like every U.S. Open, it's going to come down to just total control of your golf ball and minimise the mistakes."
|Copa del Rey draw: Barcelona to meet Sevilla in quarter-finals|
|Kohli: No one more committed to India than Dhoni|
|Brook questions Khan credibility following Crawford agreement|
|Sad Pochettino admits Bielsa is ´wrong´|
|Simeone eyes LaLiga gain after Atletico´s Copa del Rey pain|
|Rossi a no-go for Tottenham as Pochettino rules out panic buys|
|Guardiola identifies ´three or four´ midfield targets|
|Nadal encourages patience in young stars after humbling De Minaur|
|NFL playoffs 2019: 10 Opta facts for Patriots v Chiefs|
|Robertson helping Klopp learn Scottish for Dalglish chats|
|Levante appeal over alleged ineligible Barcelona player rejected|
|NFL Playoffs 2019: 10 Opta facts for Rams v Saints|
|Lowry to take three-shot Abu Dhabi lead into final round|
|Training is not for anyone else - Klopp condemns Bielsa over ´spygate´ row|
|In other countries, everybody does it - Guardiola respect remains for spying Bielsa|
|Cilic battles back to join Nadal, Federer in fourth round|
|Klopp: Trent unbelievable for playing through pain|
|Faulkner provides super start and fabulous finish to sink Scorchers|
|Ref admits error in key foul call on Lonzo Ball in Lakers-Thunder game|
|Marina Granovskaia is working very hard – Sarri ´confident´ of January signings|
|Tuchel confirms Rabiot out of PSG contention|
|Madrid derby kick-off confirmed for February 9|
|Benzema fit to face Sevilla despite broken finger, Solari confirms|
|Bournemouth boss Howe says no offers received for Wilson|
|Kerber cruises after Wozniacki, Sabalenka upsets|
|Mbappe a great player and great person, says beaming Beckham|
|Gracia confident someone will step up if Doucoure leaves for PSG|
|Albrighton signs new Leicester deal|
|Niasse joins Cardiff on loan from Everton|
|Hendrick credited with Fulham strike|
|Western Sydney Wanderers 1 Adelaide United 2: Goodwin compounds Wanderers woes|
|Chahal and Dhoni carry India to ODI triumph|
|Levante report Barcelona for alleged use of ineligible player in Copa del Rey|
|Solskjaer regrets Sanchez´s Reading setback|
|Tomic brands Hewitt a ´liar´ as feud continues|
|Ruthless Nadal thrashes teenager De Minaur|
|Wozniacki enjoyed status as defending champion in Melbourne|
|Solskjaer backs Mourinho to return to football´s big time|
|Murray to miss Open 13 Marseille|
|Solskjaer´s United turnaround no easy task, says Hughton|
|The big Friday Premier League quiz|
|How James Harden´s 2018-19 numbers compare to his MVP campaign|
|It´s insane! - Tsitsipas excited to face ´legend´ Federer|
|Sharapova ends Wozniacki title defence|
|American teen Anisimova sends records tumbling at Aus Open|
|Lakers survive Ball´s gaffe to beat Thunder in OT|
|Federer expects ´athletic´ and ´attacking´ Tsitsipas clash|
|Alcacer is fit and available – Favre|
|Fantastic Federer breezes past Fritz|
|Pogba happy with Man United approach under Solskjaer|
|Mickelson leads Desert Classic, ties career-low with 12-under 60|
|Warriors´ Durant on Curry: He´s a once-in-a-generation, once-in-a-lifetime talent|
|Patriots owner says Brady is greatest player, not just quarterback, of all time|
|Inglis to retire from representative duty this year, NRL in 2020|
|Is Beal better without Wall? Wizards star says it´s ´absolutely nonsense´|
|Rockets C Capela undergoes thumb surgery, expected back after All-Star break|
|This Week in U.S. Sports: Irving apologises, Machado´s agent isn´t happy|
|Knicks in woeful shape, but 2019 could still be bright in New York|
|Valverde not worried about Levante´s Copa appeal|
|Nowell an option for England at flanker, reveals Jones|
|Pellegrini: Arnautovic available for the right price|
|Knicks throw away 19-point lead and lose on last-second goaltending call|
|Tebow invited back to Mets´ major league spring training|
|Canelo and Jacobs agree unification fight|
|Barcelona 3 Levante 0 (4-2 agg): Dembele at the double as Barca advance|
|Levante to lodge complaint over Barcelona Copa selection|
|Kanter´s London absence ´very unfortunate´, says NBA commissioner|
|NBA could swap London for Paris in 2020|
|Spurs coach Popovich uncertain if he will return next season|
|Pistons´ Griffin fined for verbal abuse of official|