( CNN ) -- Martin Kaymer stretched his lead at the top of the U.S. Open leaderboard with a second successive round of 65 at Pinehurst No . 2 Friday . Todd Brendon scores second six in two days at U.S. Open . German makes lowest 36-hole total in tournament 's history . Former world No . 65 holds 1 -shot lead over second -placed Todd Brendon .
Todd Brendon scores second six in two days at U.S. Open . German makes lowest 36-hole total in tournament 's history . Former world No . 65 holds 1 -shot lead over second -placed Todd Brendon .