A city crew removed the graffiti from the mural, located on 16th Street near R street, police Sgt. Norm Leong said.
The swastika was reported on Thursday morning and was gone by mid-afternoon.
Police aren't sure when the vandalism took place.
A $1,000 reward is already being offered by the Anti-Defamation League to find the vandals who put a swastika on the mural earlier this month. That happened on the eve of Rosh Hashana.
Casspi did not immediately comment on Thursday's find. He was home in Israel the first time this happened and told the Sacramento Bee that the discovery was hurtful."I almost don't know what to say. It's probably just some idiot who wants some publicity. But I know the people in Sacramento, and they have been wonderful to me. I know they must feel bad about this. Same thing with the Kings. I'll just let the police handle this and focus on having a great season," he told the paper Sept. 9.
Anyone with information on either case should call Sacramento police at 916-264-5011.