SF Giants infielder Christian Koss had a very promising rookie campaign. It seems he took a liking to the back of his jersey because he apparently got a tattoo of his name on his back with the same font styling as his Giants jersey.
A picture of this purported tattoo can be seen here on social media in a screenshot from a fan as it appears to have been originally posted on Koss's Instagram account.
The tattoo artist who got Koss his new ink shared it on their Instagram and the full video process can be viewed here.