I needed to remember how good it is to be at 02 - Federer

After a shocking loss to Kei Nishikori in the first match of the 2018 ATP World Tour Finals at the O2 Arena in London, Roger Federer said that he reminded himself of the pleasure and the privilege he's had while playing here and how he needed to get back on track at the earliest.

I needed to remember how good it is to be at 02 - Federer