Discipline the key to PGA Championship glory for Rory McIlroy and Jon Rahm

Second major of the season tees off on Thursday at Oak Hill in Rochester, New York

Rory McIlroy chips to the 11th green during a practice round prior to the 2023 PGA Championship at Oak Hill Country Club. Getty

Both world No 1 Jon Rahm and third-ranked Rory McIlroy believe a disciplined strategy around Oak Hill will be the key to success at the PGA Championship this week.

Rahm arrives in Rochester, New York for the second major amid a stunning season. The Spaniard has won four times this year, including his first Masters title, and is one of the favourites to claim his third major.

McIlroy, meanwhile, has endured a mixed season so far, starting with victory at the Hero Dubai Desert Classic, but the Northern Irishman successive missed cuts at The Players and Masters.

"Discipline is going to be a huge factor this week," McIlroy, 34, said. "You've got to keep it out of those fairway bunkers.

"If someone can keep their discipline and not start firing at those pins and know that middles of the greens is a pretty good leave on most holes, I think that's (key)."

Oak Hill offers tricky pin locations with thick rough and shifting tee box areas to make every challenge unique.

"Discipline is a really good way to describe what one needs this week," Rahm, 28, said. "It's challenging, but it's one of those where if you hit the shots you're supposed to hit – put it in the fairway, go to the center of the green – nothing crazy should be happening.

"If you can get those up-and-downs, it's not only a confidence booster, but it's something that will keep the round going."

Rahm, the 2021 US Open champion, captured his fourth title of the year and second major last month at the Masters. He is co-favorite alongside second-ranked American Scottie Scheffler, who would overtake the Spaniard with a victory.

If Rahm wins, he would be halfway to a calendar-year Grand Slam and only an Open Championship shy of a career Slam.

"It doesn't happen often that a player wins more than one major in a year," Rahm said. "So it would be amazing to be able to join my name to that list."

Only five players in the past 70 years have won the first two majors of a season, the most recent being Spieth in 2015.

Spieth, who would complete a career Slam by winning the PGA, tested his injured left wrist during a workout Tuesday and a nine-hole practice round with Rahm.

The 29-year-old American is set to start Thursday morning alongside Norway's Viktor Hovland and Irishman Shane Lowry, but his status for the event remains uncertain.

McIlroy took a mental health break after missing the cut at last month's Masters and played only one PGA tune-up.

"I needed it at the time," McIlroy said. "Whether it works this week or not remains to be seen."

The four-time major winner said he has lowered expectations to better deal with whatever golf sends his way.

"Just trying to be in a good spot with taking what comes," he said.

And should that fifth major title never come, so be it.

"If I don't win another tournament for the rest of my career, I still see my career as a success," McIlroy said. "I still stand up here as a successful person in my eyes."

Six players from the LIV Series with a combined 15 major titles are at Oak Hill, including reigning Open champion Cameron Smith, six-time major winner Phil Mickelson, and four-time major winner Brooks Koepka.

Saudi-backed financing and record prize money lured some big names from the PGA Tour to LIV, prompting the tour to ban LIV players and spark a legal fight due to hit courts next May.

Until then, majors mark the only place for LIV and PGA players to compete.

Americans Mickelson and Koepka shared second at the Masters, the top major result by an active LIV player.

Two-time major winner Dustin Johnson won last week's LIV crown in Tulsa but another US contender could be Talor Gooch, a LIV winner last month in Australia and Singapore.

"I imagine he's going to keep playing well. He's a world-class ball striker and just a supreme talent," sixth-ranked Max Homa said. "He beat every single person and he shot 62-62 in back-to-back rounds (in Adelaide). I'd say it's very impressive."