Both are correct.
It's a matter of context, however both could be used interchangeably.
To help stress you may not be the only one, examples could be:
League Bowling happened in 1991.
League Bowling was created on 1991-07-01.
Revolutionary Anarchist Bowling League ended in 1991.
The name of the bowling league where players play individually is called a singles league.
Are there any samples of League Bowling Prize Fund Sheets?
The duration of Bowling Revolution P-League is 1800.0 seconds.
youth bowling league
Bowling Revolution P-League was created on 2006-04-02.
Most league bowlers own their own bowling shoes.
You must have a minimum of 4 teams. Contact the bowling center regarding scheduling. For sanction play, contact the local bowling association for the league application and a copy of the bowling rules. Develop a set of league bylaws, using the bowling rules as a guideline. Purchase a league management software, such as CDE Software's BLS bowling league secretary software to track the scores, standings and statistics as well as financials.
That would be a Scratch League.
Open bowling is either before or after league bowling. Call ahead before going to the bowling alley.