Reigning US Open champion Jordan Spieth fired a five-under par 65 Friday to achieve the lowest 36-hole start of his PGA career at his hometown Byron Nelson Championship. World number two Spieth, who began coming to the Dallas event as a child, stood on 11-under 129 at TPC Four Seasons to share second place alongside Spain's Sergio Garcia and US compatriots Brooks Koepka and Bud Cauley. American Ben Crane, seeking his sixth career PGA victory, sank a 14-foot birdie on his final hole to grab the halfway lead on 128 with a 63, but it was Spieth's performance that raised eyebrows the most.
