Texans give Whitney Mercilus four-year, $26 million extension

The Texans didn’t pick up the fifth-year option on the rookie contract of 2012 first-round pick Whitney Mercilus, but now that’s moot. Mercilus and the Texans have agreed on a four-year contract extension. John McClain of the Houston Chronicle reports that Mercilus will get a $5.25 million signing bonus, $10.8 million guaranteed and $26 million…