![A coach carries a racket loaded with balls during a practice session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2020. (AP Photo/Andy Wong Stock Photo - Alamy A coach carries a racket loaded with balls during a practice session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2020. (AP Photo/Andy Wong Stock Photo - Alamy](https://c8.alamy.com/comp/2MH6624/a-coach-carries-a-racket-loaded-with-balls-during-a-practice-session-ahead-of-the-australian-open-tennis-championship-in-melbourne-australia-sunday-jan-19-2020-ap-photoandy-wong-2MH6624.jpg)
A coach carries a racket loaded with balls during a practice session ahead of the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2020. (AP Photo/Andy Wong Stock Photo - Alamy
Bilateral Comparison of Anterior Shoulder Position in Elite Tennis Players | Published in International Journal of Sports Physical Therapy
![Alexander Zverev Sr coach and father of Alexander Zverev of Germany attends practice for main US Open 2017 championship (Photo by Lev Radin / Pacific Press Stock Photo - Alamy Alexander Zverev Sr coach and father of Alexander Zverev of Germany attends practice for main US Open 2017 championship (Photo by Lev Radin / Pacific Press Stock Photo - Alamy](https://l450v.alamy.com/450v/2mh667n/germanys-alexander-zverev-right-rests-on-his-coach-and-father-alexander-zverev-sr-watches-during-a-practice-session-ahead-of-the-australian-open-tennis-championship-in-melbourne-australia-sunday-jan-19-2020-ap-photoandy-wong-2mh667n.jpg)