Collin Morikawa, just 24 and seeking his fifth PGA tour victory, had eight birdies and two bogeys on the way to his 66 on Saturday. Adam Cairns/Columbus Dispatch via Imagn Content Services, LLC

Collin Morikawa walked off the course at Muirfield Village on Saturday afternoon having carded a third-round 66 but tied for second place, six strokes back of red-hot Jon Rahm.

Morikawa will tee off Sunday morning’s final round of the Memorial Tournament tied for the top spot after Rahm tested positive for COVID-19, meaning he will have to withdraw from the event.

Rahm shot a 64 on Saturday after a 65 on Friday and appeared in good position to chase victory with a 54-hole score of 18-under par 198.

Now, unless this evolving story takes another bizarre turn, it will be Morikawa and second-round co-leader Patrick Cantley who share the lead at minus-12.

CBS announcing the news of Rahm's positive test:

Here's the official statement from the PGA:

Max Homa, Morikawa’s fellow Cal alum, shot a 72 and is alone in sixth place, six strokes off the pace at six under par.

Morikawa, just 24 and seeking his fifth PGA tour victory, had eight birdies and two bogeys on the way to his 66 on Saturday. But no was able to keep up with Rahm, who posted nine birdies and just one bogey during the round.

Morikawa nearly recorded an ace:

And here is Morikawa's drive on the 15th on Saturday:

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