Real Madrid came out on top against Chelsea in Saturday's International Champions Cup action, while Paris-Saint Germain cruised to a 4-0 victory over English Premier League champions Leicester City.
The day started with a clash between Brendan Rodgers' Celtic and 2015/16 La Liga winners Barcelona, with Luis Enrique's side running out 3-1 winners in Dublin.
Arda Turan fired Barca in front early on, before Leigh Griffiths pounced on a defensive mistake to level the scores. However, parity was short-lived as Efe Ambrose put the ball in his own net one minute later. And the match was put beyond any doubt when Munir Mohamed slotted home in the 41st minute following good work in the build-up by Luis Suarez.
At Michigan Stadium in the United States, meanwhile, Real Madrid recorded a 3-2 victory over Antonio Conte's Chelsea in a closely contested clash.
Zidane: "I am happy, we played well and with intensity"
— Real Madrid C.F. (@realmadriden) July 30, 2016
Los Blancos produced a strong performance in the absence of the talismanic Cristiano Ronaldo, with full-back Marcelo taking centre stage. The Brazilian broke the deadlock after just 19 minutes, before adding a second on 26 minutes.
Young forward Mariano Diaz also got in on the act, netting a spectacular long-range goal to ensure Real went into the half-time break with a three-goal lead.
Chelsea produced a much-improved performance after the break, though, as Eden Hazard reduced the deficit with ten minutes remaining, before netting his second of the game in the first minute of injury-time.
At Santa Clara's Levi's Stadium, Liverpool continued their pre-season preparations with a 2-0 win over AC Milan, Divock Origi and Roberto Firmino getting on the scoresheet for the Merseysiders.
Defending Premier League champions Leicester City had a day to forget after slumping to a 4-0 defeat at the hands of Unai Emery's Paris Saint-Germain.
— Leicester City (@LCFC) July 31, 2016
The Parisians went into the break two goals to the good, Edinson Cavani opening the scoring from the penalty spot, before teenager, Jonathan Ikone doubled their advantage.
Lucas Moura and Odsonne Edouard got in on the act after the half-time interval, as PSG eased to a comfortable victory in Los Angeles.
In the final match of the day, Carlo Ancelotti's Bayern clinched a 4-1 win against Inter at the Bank of America Stadium in Charlotte, North Carolina.
United States international Julian Green staked his claim for a place in Ancelotti's team after netting a first-half hat-trick (7', 30', 35'), while winger Franck Ribery also found the back of the net in a one-sided first half.
Substitute Mauro Icardi pulled one back for the Nerazzurri at the death, but it was nothing more than a consolation as Bayern cruised to victory.
International Champions Cup results:
Celtic 1-3 Barcelona
Real Madrid 3-2 Chelsea
Liverpool 2-0 Milan
PSG 4-0 Leicester
Inter 1-4 Bayern München