One of the biggest edges you can have in fantasy football is identifying the right rookie sleepers on draft day. Last season, Christian Watson, Tyler Allgeier, and Isiah Pacheco were mostly afterthoughts in 2022 drafts, but each player came through with huge performances down the stretch as fantasy football sleepers to help win leagues.

You don't need our help telling you to select rookies like Bijan Robinson, Jahmyr Gibbs, or Jaxon Smith-Njigba in your fantasy football draft this season, so we'll dig deeper with sleeper rookie picks that are available after the 14th round, according to FantasyPros PPR Average Draft Position.

Here are five fantasy football rookie sleepers for the 2023 NFL season.

RB Tank Bigsby, JAX

Current ADP: 185.3 overall, RB52

Tank Bigsby is the exact kind of rookie running back sleeper you should look to select late in your drafts.

The most important thing for running backs in fantasy is opportunity, and Bigsby doesn't appear to have much competition for the backup role in Jacksonville behind Travis Etienne. Bigsby is substantially bigger than Etienne, and could replace him in short-yardage and goalline situations, where Etienne struggled with efficiency last year despite ranking in the top-5 in carries inside the 10-yard line.

Bigsby also has draft capital working in his favor, as Jacksonville used a third-round selection on the Auburn product. If Etienne were to miss any time, Bigsby could be stepping into a starting role in one of the league's most explosive offenses.

Bigsby was a good pass protector and competent receiver (30 receptions as a senior) at Auburn, which tends to be a big deal for rookie backs when it comes to playing time. Handcuff backs with three-down potential in great offenses aren't always easy to find, but they can pay big dividends when they hit.

Jaguars coach Doug Pederson has a history of shuffling between backs, anyway, which could lead to some sneaky Flex value even if Etienne remains healthy and this becomes more of a committee than expected.

RB Tyjae Spears, TEN

Current ADP: 216 overall, RB62

The Derrick Henry train has to get derailed at some point, right? Henry has 1,750 career rushing attempts, third amongst all active NFL backs, and he's led the NFL in carries in three of the last four seasons. Henry will turn 30 years old later this season, and not many running backs have survived that age cliff.

Henry is built different, obviously, but Spears is an inexpensive handcuff bet that Henry will miss time this season. The Titans thought highly enough of Spears to use a third-round pick in the draft on him, and Spears was dominant throughout his college career, finishing fifth in rushing yards (1,586), second in rushing TDs (19), and fourth in yards after contact per attempt (4.55).

While Spears is highly unlikely to produce any value while Henry is active, even if he siphons some passing down work, his three-down profile combined with Tennessee's desire to run the ball would make him an instant RB2 type in the event Henry misses any games.

WR Marvin Mims, Jr., DEN

Current ADP: 221 overall, WR74

It's incredible that Mims hasn't seen his value spike more given that Tim Patrick is out for the 2023 season with a torn ACL. That creates a clear path to Mims playing in three-wide receiver sets right away, and it's important to remember that Jerry Jeudy and Courtland Sutton have both dealt with plenty of injuries, as well. Jeudy could miss at least the first game of the season with his hamstring injury.

Perhaps more importantly, Sean Payton and the Broncos traded up in the second round to draft Mims. If Payton's past playing time distribution in New Orleans can give us any clues, the rookie wide receiver could be heavily utilized right away. The price on Mims may stay low as well, as he's been dealing with a hamstring injury throughout training camp and might not “flash” in preseason the way other rookie sleepers could.

Mims has everything you want in a rookie sleeper: blazing speed and impressive athleticism (4.38 40-yard-dash, a 39.5-inch vertical), a history of major college production (1,083 receiving yards last season), and an attachment to a quarterback not afraid to throw the deep ball, and a playing time opportunity waiting to be grabbed.

Russell Wilson and the Denver offense have nowhere to go but up with Sean Payton in town, and Mims could be a big part of those plans.

WR Michael Wilson, ARI

Current ADP: 270 overall, WR101

Preseason football can paint the picture sometimes, and it appears that Wilson could be locked into a spot in 2-WR sets with Marquise Brown, as Rondale Moore may only play out of the slot.

Wilson was a fourth-round selection by the rebuilding Cardinals, and Arizona's new regime and coaching staff may want to see what they have right away, especially with Marquise Brown on an expiring contract. Wilson has reportedly been tearing up Cardinals training camp and brings size and strength outside (6-foot-2, 213 pounds) that the rest of Arizona's receivers seem to lack.

While it's still unclear when Kyler Murray will make his debut, Wilson is the kind of stash pick who could pop for a team that should be forced to throw quite a bit, as Arizona's over/under on total wins is 4.5, according to Fanduel.

Wilson's run blocking should keep him on the field, but it's the garbage time receptions we're hoping for. There's a lot of sneaky sleeper value here for Wilson to rack up the receptions.

RB Keaton Mitchell, BAL

Current ADP: 431 overall, RB118

Mitchell may be one to closely monitor rather than draft, as evidenced by his ADP. But if you're looking for a true rookie sleeper who could make an impact, Mitchell could fit the bill.

Baltimore's backfield is a little messy. J.K. Dobbins was just activated off the PUP list, Gus Edwards is recovering from last year's knee injury, Justice Hill hasn't been heavily utilized in three seasons, and Melvin Gordon is way past his prime. If Mitchell can continue to impress on special teams and as a returner, he can offer an element of speed and explosiveness that Baltimore currently lacks.

You have to dig deep sometimes for the best fantasy football rookie sleepers, and it certainly feels like just about anyone can put up big stats in Baltimore's rushing scheme behind Lamar Jackson.