 The short summer vacation is over for NFL players. It's time to begin the journey to Super Bowl 59. The Baltimore Ravens became the first team to open training camp when they welcomed rookies on Saturday. 19 more teams get underway this week, and all 32 clubs will open doors by July 24th. Patrick Mahomes and the Kansas City Chiefs are aiming to become the first team to three-peat since the 1965-67 Green Bay Packers.