Juventus must improve all aspects of their performances if they are to challenge in Serie A this season, manager Thiago Motta said on Friday, after four wins in 10 games has left them sixth. Despite remaining unbeaten in the league, just two wins in their last eight games have left Juve with 18 points, seven behind leaders Napoli. On Saturday, Motta's side visit Udinese, who are seventh on 16 points, having suffered four losses in their last six games. Juve finished third last term, 23 points