World championship leader Lewis Hamilton could only finish seventh after serving a time penalty for coming into the pitlane when it was closed, dropping him to the back of the field.
Kek acknowledged that there are still problems in creating opportunities, but said four points were a good tally for the start of the competition.
The disappointing results and performances in the country's first two games after a 10-month long break caused by the COVID-19 pandemic might have provided evidence of how difficult it is to propel Germany forward.
The Netherlands' Dafne Schippers was fastest in the women's 100m, while there was joy for Poland as Justyna Swiety-Ersetic won the 400m and Maria Andrejczyk was victorious in the women's javelin, throwing 65.70m to finish ahead of Lina Muze of Latvia and Croatia's Sara Kolak. Enditem
"I've been playing well the past couple of weeks, training well, focussing on the right things, maintaining that level of performance and hoping for the best. I'm feeling confident about my game and taking that to every match I play."
However, the hectic last 11 games saw Atletico find form and as rivals such as Real Sociedad and Getafe lost ground, in the end the top four was secured with relative ease.
Inter Milan midfielder Barella headed home in first-half stoppage time after receiving a long pass from Ciro Immobile, with the goal enough for Italy to clinch three points in Amsterdam.
In an absorbing third round match, 23-time Grand Slam winner Williams rallied to defeat 2017 US Open winner Sloane Stephens 2-6, 6-2, 6-2 in one hour and 43 minutes, while second seed Kenin also faced a tough challenge in a straight sets win over Ons Jabeur of Tunisia.
Looking to hold onto their narrow lead, Slovakia played more defensively in the game's later stages, and were punished for their caution in the first minute of injury-time, when Ilay Elmkies equalized from Yonatan Cohen's through-ball.
The Guangdong team ranked first in the group dressage competition on Friday, followed by Tibet. Jiangsu took third place.
Despite foreseeable setbacks, Loew is going to stick to his plan, Kroos underlined. The German intends to give space for promising youngsters such as the new Chelsea arrivals Kai Havertz and Timo Werner.