Question: Please enumerate the shot exchanges in the rally, starting from 51 minutes 30 seconds, until the Swiss team wins the point.
Answer: Zverev's serve -> Bencic's return -> Zverev's shot ->  Bencic's return -> Zverev's shot ->  Bencic's return -> Zverev's shot -> Federer's shot -> Zverev's return -> Bencic's shot -> Kerber's shot -> Bencic's return -> Zverev's shot -> Bencic's return -> Zverev's shot -> Bencic's shot -> Kerber's shot -> Federer's shot -> Zverev's shot is out