Defending UEFA Champions League winners Liverpool faced an opening defeat to their 2019-20 continental campaign against Napoli as the new season kicked-off in full throttle. Meanwhile, 2018-19 semifinalists Barcelona were held to a 0-0 draw on Matchday 1. Serie A side Inter Milan were held to a 1-1 draw by Slavia Prague. Ligue 1 outfit Lyon also drew to Zenit Saint Petersburg. Frank Lampard faced an early defeat in his European debut as manager, as Chelsea lost to Valencia. Red Bull coasted past Genk, meanwhile, Ajax defeated Lille in style. Also, RB Leipzig defeated Benfica.