From Longman Dictionary of Contemporary Englishtopspintop‧spin /ˈtɒpˌspɪn $ ˈtɑːp-/ noun [uncountable] DSthe turning movement of a ball that has been hit or thrown in such a way that it spins forward
Examples from the Corpus
topspin• An option also allows for topspin or slice to be added.• Taylor, who was right-handed, typically delivered his ground strokes with neither topspin nor undercut.• Sampras put a lot of topspin on that serve. 