Frank Lampard's goal could not prevent an almost full-strength Chelsea from slipping to a 2-1 pre-season friendly defeat away to Hamburg.
Lampard put the Blues ahead in the 24th minute, tapping Michael Essien's unselfish square pass into an empty net, but Mladen Petric capitalised on a mistake by Yury Zhirkov, on at left-back for Ashley Cole, to beat Ross Turnbull with 18 minutes to go.
Worse was to come for the Premier League champions as Heung Min Son won it for Hamburg with three minutes to go, inflicting Chelsea's third successive loss of the summer following defeats to Ajax and Eintracht Frankfurt.
Carlo Ancelotti named a strong side for the game in Germany, with John Terry, Branislav Ivanovic, John Obi Mikel, Nicolas Anelka, Salomon Kalou and Florent Malouda all also featuring from the start, while Didier Drogba played the second half, his first pre-season outing following hernia surgery.
Manchester City also lost to German opposition, going down 3-1 to Borussia Dortmund at the Westfalenstadion.
Paraguay striker Lucas Barrios put Dortmund ahead with a ninth-minute penalty only for Jo, who spent time on loan at Everton and Galatasaray last season, to level two minutes later.
Joe Hart ensured City went into half-time on level terms by diving to his right to keep out a casual Barrios penalty. But the Germans restored their lead five minutes after the break through Shinji Kagawa and Robert Lewandowski wrapped up the win in the 81st minute.
Manchester United hammered an Airtricity League XI 7-1, as Mexican striker Javier Hernandez impressed again.
Park Ji-Sung opened the scoring and Michael Owen also found the net on his first appearance of pre-season but there was nothing for Wayne Rooney during a typically industrious 45-minute display.
Hernandez struck with his first touch just after the half and resistance was ended by Valencia just before the hour, with Park, Jonny Evans and a Nani penalty adding further efforts, although St Patricks' Dave Mulcahy probably enjoyed the greatest moment of his career when he drilled home the hosts' consolation.
Wigan lost 3-1 to Real Zaragoza at the DW Stadium. The La Liga side's 34th-minute opener came when Steve Gohouri's sliding clearance rebounded off Marco Perez who raced into the penalty area only to be brought down by goalkeeper Chris Kirkland.
Jorge Lopez converted from the spot but an even worse error led to the equaliser seconds before half-time when Carlos Diogo rolled a free-kick straight into the path of Ben Watson. After moving the ball on the midfielder eventually laid on the pass for Charles N'Zogbia to round goalkeeper Leo Franco.
However, 15 minutes from time Braulio Nobrega capitalised on a quick ball forward to clip past Kirkland before Gabriel Fernandez smashed in an unstoppable 35-yard effort.
Jermaine Beckford and Diniyar Bilyaletdinov struck as David Moyes' Everton continued their pre-season preparations with a comfortable 2-0 win over their Chilean namesakes, Everton de Vina del Mar.
The pair were on target in the second half as the Merseyside club took on the South American side named after them for the first time in an historic friendly.