|Valero Texas Open second-round leaderboard|
|-8 B Cauley, T Finau (both US); -7 B Estes, R Shelton, K Chappell (all US), C Smith (Aus); -6 J Randolph, J Huh (both US); -5 O Schniederjans, J Walker (both US), A Baddeley (Aus), C Petterson (Swe), M Laird (Sco), B Grace (SA), S Kang (Kor)|
|Selected others:-2 G McDowell (NI); E A Johnston (Eng), S Power (Ire); +1 G Owen (Eng); +2 I Poulter (Eng); +4 L Donald (Eng)|
Graeme McDowell had a disappointing second round at the Valero Texas Open as he shot a two-over-par 74 to fall back to six off the lead.
Northern Irishman McDowell had started the day two behind overnight leader Branden Grace.
American pair Bud Cauley and Tony Finau share the lead at the halfway point on eight under par
McDowell, 37, had five bogeys and three birdies in Friday's round and made the cut by two shots.
Ireland's Seamus Power survived to the weekend on the cut mark of level par after a second successive 72.