 Day 12 in Wimbledon, the men's semis. ABC's Tom Rivers with details from the All England Club. Defending champ Carlos Alcarez in action today against Daniel Medvedev. Keep fighting and try to get the good rhythm. Once you get it, try not to be down again. In the other semi, Novak Djokovic against Lorenzo Mussetti. Novak says his right knee is holding up. I think if it was for any other tournament...