The New Jersey Nets reached agreements with free agent forwards Jarvis Hayes and Eduardo Najera. Terms of the agreements were not released. Hayes, the 10th overall pick in the 2003 NBA draft out of Georgia, played in 82 games for Detroit last season and averaged 6.7 points and 2.2 rebounds. Najera averaged 5.9 points for Denver. ... O.J. Mayo's professional debut featured 15 points, five assists and three steals in the Memphis Grizzlies' 88-75 win over the New Orleans Hornets at the NBA summer league.