Definition of "flyball"

Pérez, a flyball pitcher, recorded only two fly outs, and one of the two balls hit Anderson’s way — Fielder’s three-run homer in the first — traveled an estimated 447 feet and dented a strip above the Miller Lite sign on the center-field scoreboard.

2007 August 2, Ben Shpigel, “Shaky at the Start, Pérez Settles in to Strike Out 11”, in New York Times‎