Also, why would a "pro" want to sandbag like this? I've been an amateur athlete most of my life and my goal was never to compete against known weaker athletes - there's no fun in that.
Or, do these games lack the ability to spin up "practice" sessions fully under the control of the player? That seems like the real answer, and would mirror what athletes in meat-space do - train for weeks/months, then compete at well-timed intervals against the best (or, at least relatively equal, if you're doing age group amateur competitions).