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It was an undrafted rookie, Jay Lee, who led the Lions' talented receiver corps in catches during the team's mock game Saturday at Ford Field.

(Mike Mulholland | MLive.com)

DETROIT -- The Lions have some big guns in their aerial attack. Guys like Golden Tate, who led them in receptions the past two years. And Marvin, Jones, who just signed a $40 million deal. And Anquan Boldin, who has 300 more career catches than Calvin Johnson.

So which led the Lions in receiving during their annual mock game at Ford Field?

None of them.

It was Jay Lee, an undrafted rookie out of Baylor, who was Detroit's best offensive player Saturday. He was one of three offensive players to haul in a touchdown pass (along with Tate and tailback George Winn), and finished with a team-best six catches overall.

An effort so good, even he lost count.

"I think it was five-for-five," he said, selling himself one catch short.

Lee grabbed five of his six receptions in the first half alone, including two in a row that helped the second-team offense drive for a field-goal attempt as time expired. One was a long catch along the left sideline where he had to tip-toe to get in.

Then on his first play after halftime, Lee drew a 37-yard pass interference call against Crezdon Butler. And on the next, he got separation from Butler and hauled in a 4-yard touchdown pass from Dan Orlovsky.

Most encouraging of all, at least from an offensive perspective: Most of Lee's production came against the starting defense.

"I think I did pretty well," Lee said. "There's still a lot of things I still have to go out and fix, as far as what I'm doing out on the field. But like I said, I think I did pretty well out there today."

Lee is nearly 6-foot-2 and was a big-play threat at Baylor, where he averaged 19.9 yards per catch last season. The Lions targeted him in the draft, and after deciding to forgo receivers on Day 3, made Lee one of their top priorities in free agency.

He's been good enough throughout the offseason to warrant consideration for Detroit's fifth receiver job, behind Marvin Jones, Tate, Boldin and TJ Jones. But there's a lot of competition stacked up behind those guys too.

Jeremy Kerley, Andre Roberts and Andre Caldwell all have track records in the league, and Kerley and Roberts offer versatility as return men as well.

Lee is getting some unexpected competition from another rookie, Quinshad Davis, as well.

"I would say Quinshad -- and I'd put Jay Lee in the conversation too -- they're probably the two best undrafted rookie receivers I've been around," Orlovsky said.

The Lions are a long way from settling that derby at receiver, but Lee certainly gave himself some momentum heading into next week's road trip against Pittsburgh, where two practices and an exhibition should give the club a better feel for where its receivers stand.

"Obviously it's against our guys (today), and we've been going against them for about two or three weeks now," Lee said. "So it's a good feeling going into Pittsburgh week."