DUBAI, United Arab Emirates — Rory McIlroy hit wedge into 5 feet for birdie on the 18th hole for a 2-under 70 to regain the outright lead in the Dubai Desert Classic on Friday. The chief challenge for McIlroy came from an American — but it wasn't Tiger Woods. Brooks Koepka, who earned his European Tour card last year by winning three times on the Challenge Tour, made seven birdies against no bogeys for a 65 that left him one shot behind McIlroy going into the weekend.