Costeen Hatzi watches Nick Kyrgios play at Wimbledon

Playing tourist! Tennis bad boy Nick Kyrgios and girlfriend Costeen Hatzi go sightseeing in London

Nick Kyrgios' older brother Christos welcomes a baby boy with girlfriend Alicia Gowans

Nick Kyrgios packs on the PDA with girlfriend Costeen Hatzi as she cheers him on at Wimbledon