![Alexander Zverev in action for Germany in his Davis Cup singles rubber against Arthur De Greef of Belgium; Getty Images | Tennismash Alexander Zverev in action for Germany in his Davis Cup singles rubber against Arthur De Greef of Belgium; Getty Images | Tennismash](https://tennismash.com/wp-content/uploads/2017/02/Zverev-DC.jpg)
Alexander Zverev in action for Germany in his Davis Cup singles rubber against Arthur De Greef of Belgium; Getty Images | Tennismash
![Tennis player NINO SERDARUSIC of Croatia in action during the match against Belgian player De Greef..., Stock Photo, Picture And Rights Managed Image. Pic. CKP-P201805060329401 | agefotostock Tennis player NINO SERDARUSIC of Croatia in action during the match against Belgian player De Greef..., Stock Photo, Picture And Rights Managed Image. Pic. CKP-P201805060329401 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/b288a2b2e8745174ce92cd108d05e901/ckp-p201805060329401.jpg)
Tennis player NINO SERDARUSIC of Croatia in action during the match against Belgian player De Greef..., Stock Photo, Picture And Rights Managed Image. Pic. CKP-P201805060329401 | agefotostock
![Belgian tennis player Arthur De Greef pictured during the Belgium training in Brussels on November 14, Belgian tennis player Arthur De Greef pictured during the Belgium training in Brussels on November 14,](https://l450v.alamy.com/450v/2f3ke28/belgian-tennis-player-arthur-de-greef-pictured-during-the-belgium-training-in-brussels-on-november-14-2017-before-the-davis-cup-2017-final-tennis-match-on-november-14-2017-at-pierre-mauroy-stadium-in-villeneuve-dascq-near-lille-france-photo-geoffroy-van-der-hasselt-dppi-2f3ke28.jpg)