Thought this was interesting. Fuller struggled in the slot but was elite on the outside. per PFF article:
In 2018, Fuller’s 57.9 slot coverage grade ranked sixth out of the six players who logged at least 400 slot coverage snaps. Opposing quarterbacks completed 76.7% of their passes when targeting Fuller in slot coverage, and his forced incompletion rate dropped down to 8.2%. He surrendered a first down or touchdown on 45.2% of his targets and opposing quarterbacks earned a 110.5 passer rating when targeting him.
Despite his struggles from the slot in 2018, Fuller shined in coverage when he was given the opportunity to cover out wide. The third-year cornerback registered 103 coverage snaps from an outside corner position, and out of the 101 players who saw at least 100 coverage snaps out wide, he ranked first with a 90.7 coverage grade. He ranked first among that group by holding opposing quarterbacks to just a 35.3% completion percentage when targeted as a wide corner and both of his interceptions came when playing out wide.
https://www.pff.com/news/pro-the-chi...s-best-in-2019