I'm in doubt again

What's the difference between "I usually play tennis on Saturday morning" and "I usually play tennis on Saturday mornings"???
(If there is a difference...)
Thank you!
Daniela
on Sunday
We're going to a match on Sunday.
What are you doing Sunday? American English
Sunday morning/afternoon etc
Sunday nights are usually pretty quiet.
last Sunday
It was our wedding anniversary last Sunday.
this Sunday
There's another antiques market this Sunday.
next Sunday (=Sunday of next week)
We'll announce the winners next Sunday.
a Sunday (=one of the Sundays in the year)
Finding a dentist on a Sunday can be very difficult.
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