The Detroit Lions receiver and the former Virginia Tech cornerback have a grudge-match race to resolve, once and for all.
"I'm very competitive, especially with my brothers," Kyle Fuller said at the NFL Scouting Combine. "That's helped me to where I am now. We always want to be better than the next guy, each other, no matter how fast we are, the plays we make."
Kyle Fuller is considered a late first-round to early second-round pick in the next tier of cornerbacks available in May's NFL Draft behind top two cornerbacks: Oklahoma State's Justin Gilbert and Michigan State's Darqueze Dennard.
He has good size at 6-foot, 190 pounds and describes himself as a physical corner. Some NFL talent evaluators see him fitting in nicely as a slot corner early in his career.
But can he run?
Detroit Lions general manager Martin Mayhew has said in the past that he values speed in his secondary.
"I'm trying to beat Corey's 4.37," Kyle Fuller said of his brothers unofficial 40 time at last year's Combine.
Corey Fuller ran an official 4.43.
"We've had a couple races," Kyle Fuller said. "I won one, Corey won one. Whenever we're home, we'll get it."
Corey Fuller was a sixth-round pick by the Lions in last year's draft. He spent his rookie season on the practice squad, but Mayhew said he's looking forward to seeing Fuller's progress when the team gets back on the field April 7.
"Corey's got size, he's got speed," Mayhew said. "He was a guy that was a track guy that came to football late. He's really, I think, improved since we've had him.
"His big thing is a need to get stronger in the weight room. I think he's worked very hard at that. I think another year in the offseason program's really going to benefit him quite a bit, so I'm looking forward to seeing him.
"You know, it's hard to find guys that are 6-2 that run 4.39. He's one of those kinds of guys, so I'm excited about seeing him work."
Kyle Fuller comes from good genes and will be the third brother to enter the NFL. Older brother Vincent spent six seasons with the Tennessee Titans as a defensive back. He also had a brief stint with the Lions in 2011.
There's a fourth Fuller brother, Kendall, who was a second-team All-ACC performer as a freshman cornerback at Virginia Tech this past season. He had six interceptions in 2013.
Kyle Fuller was ask about the possibility of joining brother Corey in Detroit and said he'd love it.
Who knows, if somehow that happens the grudge-match race could be headed to Allen Park this spring.