A late surge from American Billy Horschel has seen him take a two-stroke lead at the halfway point of the PGA Tour&aposs Texas Open. Two bogeys in his opening four holes made the going tough early in the 26-year-old&aposs second round at TPC San Antonio – but six birdies from that point, including his final two holes of the day, saw him move to eight under the card. His 68 was enough to give him a two-stroke buffer over compatriots Daniel Summerhays (69) and Charley Hoffman (67), with Australian Steven Bowditch (69) joining that pair on six under the card. World number two Rory McIlroy continued to find some form ahead of next week&aposs Masters, with his 67 propelling him to five under the card, where he is joined by five others. South Korean KJ Choi carded a 67 to join that chasing pack, which consists of Americans Jim Furyk, Ben Kohles and Lee Janzen as well as South African Retief Goosen. Joint overnight leaders Matt Bettencourt and Peter Tomasulo both tumbled down the standings, with their 73s seeing them on four under, where they are joined by fellow American Jason Gore.