Rose wary of U.S. Open champ Koepka heading into weekend

With Brooks Koepka lurking, Justin Rose is aware of the challenge ahead at Pebble Beach. Justin Rose admitted two-time reigning champion Brooks Koepka's name is looming large at the halfway stage of the U.S. Open. Englishman Rose posted a second-round 70 to maintain his position atop the leaderboard in California on Friday. Koepka (69) – …