William Kempner

William Kempner blazes a four-seam fastball past Gabriel Arias for the K

This browser does not support the video element. Pitch Type: Four-Seam Fastball Pitch Speed: 95.2 mph Spin Rate: 2244 rpm Most Recent Game AB: Gabriel Arias P: William Kempner July 11, 2026

William Kempner fires a four-seam fastball past Petey Halpin for strike three

This browser does not support the video element. Pitch Type: Four-Seam Fastball Pitch Speed: 96.4 mph Spin Rate: 2432 rpm Most Recent Game AB: Petey Halpin P: William Kempner July 11, 2026

William Kempner sneaks a sweeper past Travis Bazzana for strike three

This browser does not support the video element. Pitch Type: Sweeper Pitch Speed: 80.6 mph Spin Rate: 2929 rpm Most Recent Game AB: Travis Bazzana P: William Kempner July 11, 2026

This browser does not support the video element. February 23, 2026

This browser does not support the video element. May 17, 2023

William Kempner strikes out Nick Kurtz with a sinker

This browser does not support the video element. Pitch Type: Sinker Pitch Speed: 93.3 mph Spin Rate: 2362 rpm Nasty Pitch AB: Nick Kurtz P: William Kempner July 3, 2026

William Kempner's cutter fools Brandon Marsh

This browser does not support the video element. Pitch Type: Sweeper Pitch Speed: 84.4 mph Spin Rate: 2769 rpm Nasty Pitch AB: Brandon Marsh P: William Kempner June 15, 2026

William Kempner fires a four-seam fastball past Kyle Schwarber for strike three

This browser does not support the video element. Pitch Type: Four-Seam Fastball Pitch Speed: 97.3 mph Spin Rate: 2567 rpm Nasty Pitch AB: Kyle Schwarber P: William Kempner June 15, 2026

William Kempner retires Geraldo Perdomo with a cutter

This browser does not support the video element. Pitch Type: Cutter Pitch Speed: 86.1 mph Spin Rate: 2657 rpm Nasty Pitch AB: Geraldo Perdomo P: William Kempner June 10, 2026

William Kempner sneaks a sweeper past Pavin Smith for strike three

This browser does not support the video element. Pitch Type: Sweeper Pitch Speed: 81.7 mph Spin Rate: 2976 rpm Nasty Pitch AB: Pavin Smith P: William Kempner June 10, 2026