Jonathan Singleton of the Fresno Grizzlies drives in 10 runs in a 17 – 6 beating of the Albuquerque Isotopes in the Pacific Coast League. He goes 4 for 6 with two homers, including a grand slam, in setting a new club record for RBIs.

On May 13, 2015 — Jonathan Singleton of the Fresno Grizzlies drives in 10 runs in a 17 – 6 beating of the Albuquerque Isotopes in the Pacific Coast League. He goes 4 for 6 with two homers, including a grand slam, in setting a new club record for RBIs.

Source:
Baseball Reference May 13