Two-way star Shohei Ohtani was stung for six runs over 3⅔ innings Thursday as he started his pitching season with two straight defeats and the Los Angeles Angels lost 10-5 against the Texas Rangers.

Ohtani (0-2), the reigning American League MVP, was given a two-run first-inning lead but allowed two singles and a walk in the second before Jonah Heim homered down the right-field line at Globe Life Field for a grand slam, connecting on a hanging 0-2 split-fingered fastball.

"I blew that. He hit that mistake on the button," said Ohtani, who had not previously surrendered a grand slam or a home run off his splitter in MLB.