How many letters does the top answer for “a baseball pitch thrown with little speed or spin” have?

The most common answer is knuckleball (11 letters).

Crossword clue: a baseball pitch thrown with little speed or spin

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

knuckleball 11 letters wn-def

a baseball pitch thrown with little speed or spin

knuckler 8 letters wn-def

a baseball pitch thrown with little speed or spin