Here is a video all about improving your Single Stroke rolls. I have found that the best way to improve your singles is by practicing short groups of single strokes. These exercises build strength in the wrists and fingers.

There is an explanation error in the last few exercises. I am playing 16th notes with one hand while playing the 4 note bursts, not 8th notes as I state in the video.

Other videos on this channel that deal with this topic are here:
Mitchell Peters Etude    • Fast Single and Double Strokes Study...  
Three Camps Single Stroke Etudes    • Single Stroke VariationsLet's Go Cam...  
Single Strokes Revisited    • Short Single Stroke RollsBasic Hand ...  
If you search the word "Single" on my channel you will find several more solos that feature open rolls.
The books featured in this video are available from me at [email protected]
The sticks are 66gram Zebrawood concert sticks with a barrel tip which I make and sell.
If you are interested in a pair, contact me at [email protected]