Mike Scioscia filed an official protest after the Los Angeles Angels lost 7-5 to the Kansas City Royals on Wednesday night.
Scioscia said he is "100 percent" certain the protest would be upheld.
The Angels claim Raul Mondesi ran inside the line on a bunt single in the seventh inning, which led to a throwing error and two runners scoring.
"It's not a judgment call," Scioscia said. "I would not have protested if I was not 100 percent correct on this. This is a misinterpretation of a rule. It was very clear. Phil Cuzzi, the home plate umpire, had Mondesi running inside the line in jeopardy the whole way and stated that it's OK, because he was stepping back toward the bag, which is wrong."
Cuzzi said he couldn't comment because of the pending protest.