What does L10 mean in player props?
L10 means a player's last 10 games. "7 of 10" at a line says he cleared that exact line in 7 of his last 10 games. L5 and L20 are the same count over 5 and 20 games.
How it's counted
Take tonight's line, say Over 5.5 rebounds, and look at his last 10 games. Each game with 6 or more rebounds is a hit. A line that moves changes the count, so always check it against tonight's number.
Why it helps
It is quick and honest about recent form: a role change, a new teammate or a slump shows up in L5 and L10 before the season numbers.
Its limits
Ten games is a small sample. 7 of 10 can easily be luck.
It ignores the price. A 7 of 10 history at -250 can be worse value than a 5 of 10 at +150.
It ignores tonight: the defense, who is out, minutes, home or away, rest and weather. Read it together with those, not alone.
Books see the same numbers. Popular public stats are usually already in the price.
Questions
Is L10 better than season stats?
Neither is better alone. L10 catches recent changes; the season adds sample size. Look at both, and at his games against tonight's opponent.
What is a good hit rate?
It depends on the price. A line at -150 needs to win about 60% of the time to break even; at +150 about 40%.