Climb the fence

You climb the fence, taking a moment while on top to scan the area for any other infected.

Seems it's only you and those two.

At first you're cautious, sneaking your way across the court without alerting either of them, but at some point you muck up and get spotted. But... even then they do nothing. Occasionally they look at you, but they get drawn back in into the game. How strange. At least it gives you a chance to walk up close to one of the infected without being assaulted outright. Still, you stay on guard just in case.

They're still swinging their rackets. Perhaps they still retained some of their tennis skills? It'd be interesting to see them play. Amusing at the very least.