The Knicks still want to sign a third point guard and Sebastian Telfair, for the vet minimum, is in their crosshairs. The Lincoln High School alum and cousin of Stephon Marbury could thrive at the Garden, in his ninth season. He played 59 games last season for Phoenix and Toronto. “He certainly would consider the Knicks strongly,’’ agent Andy Miller said. The Knicks also have contacted reps for Earl Watson, Will Bynum, Aaron Brooks and Devin Harris.