 Singles action at Wimbledon continues as round four rolls on. On the men's side, American Taylor Fritz defeated four-seed Alexander Zarev, while four-time champion Novak Djokovic is facing off against 15-seed Holger Ruhn. On the women's side, American Danielle Collins was eliminated after losing in straight sets, while four-seed Elena Rabakina advanced to the quarterfinals after her opponent retired from their match. I'm Lisa Taylor.