Sept. 4 (UPI) -- New coach Brian Schottenheimer challenged the Dallas Cowboys to "play free" in the NFL season opener Thursday against the Philadelphia Eagles, who are among the biggest betting favorites of Week 1. Kickoff is 8:20 p.m. EDT at Lincoln Financial Field. The matchup of NFC East division foes will air on NBC. (The full slate of Week 1 NFL matchups is available below.) "Every game we play is just another championship opportunity," Schottenheimer told reporters. "We get a chance to go