So, what is up with Clay's troubles with runners on base and why is he suddenly becoming so reliant on his fastball? Well, have you considered the fact that he isn't yet comfortable with his catcher? Pitchers have to be confident in both their pitch and the guy they are throwing it to and I doubt Clay is there yet. In his 5 spring training games he pitched 3 different catchers. The one catcher he threw to multiple times (3 to be exact) was Blake Swihart .
Please do not interpret this as a call to bring up Swihart to save Clay's season, just think of it during Clay's next start when there is a runner on base and he sticks with his fastball.