Rory McIlroy leads the season-ending DP World Tour Championship after the opening round, but Race to Dubai frontrunner Collin Morikawa was Thursday's big winner.

A seven-under 65 gave McIlroy a two-stroke advantage at the top of the leaderboard at Jumeirah Golf Estates, with Tapio Pulkkanen, Joachim B. Hansen and Christiaan Bezuidenhout in a three-way tie behind him.

McIlroy, whose 14th and most recent European Tour win came at the WGC-HSBC Champions in 2019, made a flying birdie-eagle start and only dropped a single shot all day at the ninth.

After turning in 31, the Northern Irishman protected his day-one advantage over a steady back nine.

McIlroy, who beat Morikawa at the CJ Cup last month, believes he has "got [his] golf game back" since contributing only a single point to Europe's Ryder Cup defeat.

"I'm just excited for the road ahead, because I feel like I'm on the right path," he said.

But the main focus this week is on the Race to Dubai, in which McIlroy is 20th and out of the running.

A strong start for @collin_morikawa

As things stand, he would become the first American to win the Race to Dubai.#DPWTC | #RolexSeries pic.twitter.com/65HgovEsQD

— The European Tour (@EuropeanTour) November 18, 2021

First-placed Morikawa has competition chiefly from fellow American Billy Horschel this week following Jon Rahm's withdrawal, although four other players could also yet scoop the seasonal title with 2,000 points on the line in Dubai.

Of the six contenders, Morikawa is best placed heading into Friday after his four-under 68 secured a share of fifth.

Crucially, Horschel endured a difficult start as three bogeys across four holes on the back nine set him back and he carded a two-over 74 – a hugely damaging deficit given his need to outperform Morikawa.

Rounds of 70 for Tyrrell Hatton, Matt Fitzpatrick and Paul Casey kept the English trio in the mix, although each need to win and see Morikawa struggle. Min Woo Lee, the sixth man in contention, has work to do from even par.