Daniel Altmaier was frustrated by losing his serve to Tommy Paul at a crucial time during their Hamburg Open quarterfinal in Germany.

Welcome back to the Monday Tennis Briefing, where will explain the stories behind the stories from the past week on court. This week, the tennis default rule reared its head, two players took very ...

Altmaier kicked his racket into the Hamburg Open crowd after a frustrating break of serve but was only issued a code ...