The U.S. Open already showed us that a 36-hole lead can be erased as we watched Brooks Koepka come from five strokes behind to claim the event for the second year in a row.
Here are five big names from the chase pack that the leaders should be worried about heading into Saturday at Carnoustie.
Despite opening with two mediocre even-par rounds, Woods remains in the mix. He leads the Tour in Round 3 scoring average and is tied for second in fairways hit this week. He's one solid round of putting away from making some serious noise on moving day.
Koepka should not be counted out, as he faces the exact deficit after 36 holes he did at Shinnecock Hills. After a horrid opening nine at Carnoustie, the 28-year-old is 6-under over his last 27 holes. He's made 10 birdies this week, second most behind Tony Finau. Brooks remains a favorite even though he's five shots off the pace.
Noren is notorious for his weekend heroics, coming from well behind in his last three victories on the European Tour. He was on the wrong side of the draw through the opening two rounds but is tied for fourth this week in greens in regulation. Give the Swede some ideal scoring conditions and he'll be able to erase his five-shot deficit with ease.
We don't need to list the achievements of Spieth in his young career to show why he is as dangerous as any player in the field. The defending champion sits just three shots back despite telling reporters on Golf Channel that he didn't even have his "B-game" thus far. If he can capture the form he showed last year at Royal Birkdale, it could be another successful two days for the 24-year-old.
Despite having never won a major title, Fowler always seems to be around the lead at golf's biggest events. The 29-year-old sits just three shots off the pace, and already showed at The Masters he's capable of making a run at the leaders.
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